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Background: We investigated the spinopelvic parameters of lumbar lordosis (LL), pelvic incidence (PI), pelvic tilt (PT) and sacral slope (SS) in patients with fragility fractures of the pelvis (FFPs). We hypothesized that these parameters differ from asymptomatic patients. Methods: All patients treated for FFPs in a center of maximal care of the German Spine Society (DWG) between 2017 and 2021 were included. The inclusion criteria were age ≥ 60 years and the availability of a standing lateral radiograph of the spine and pelvis in which the spine from T12 to S1 and both femoral heads were visible. The baseline characteristics and study parameters were calculated and compared with databases of asymptomatic patients. The two-sample t-Test was performed with p < 0.05. Results: The study population (n = 57) consisted of 49 female patients. The mean age was 81.0 years. The mean LL was 47.9°, the mean PT was 29.4°, the mean SS was 34.2° and the mean PI was 64.4°. The mean value of LLI was 0.7. LL, LLI and SS were significantly reduced, and PI and PT were significantly increased compared to asymptomatic patients. Conclusions: The spinopelvic parameters in patients with FFPs differ significantly from asymptomatic patients. In patients with FFPs, LL, LLI and SS are significantly reduced, and PI and PT are significantly increased. The sagittal spinopelvic balance is abnormal in patients with FFPs.

This retrospective observational study evaluated improvement in coronal malalignment (CM) after anteroposterior staged surgery using lateral lumbar interbody fusion (LLIF) in patients with coronal lumbar curve adult spinal deformity (ASD). Sixty patients with ASD underwent surgery; 34 had SRS–Schwab type L lumbar curve. Patients with a coronal balance distance (CBD) ≥20 mm were diagnosed with CM. Using the Obeid CM classification, we classified the preoperative coronal pattern as concave CM (type 1) or convex CM (type 2). Demographic, surgical, and radiological parameters were compared. Whole-spine standing radiographs were assessed preoperatively and postoperatively. Twenty-three patients had type 1A, six had type 2A, five had no CM, and none had type 1B or 2B according to the Obeid CM classification. Compared with patients with Obeid type 1A, those with Obeid type 2A had significantly higher preoperative and postoperative coronal L4 tilts and a smaller change in corrected CBD (Δ|CBD|) (76.6 mm vs. 24.1 mm, p < 0.001). At the final follow-up, 58.6% (17/29 patients) of patients with SRS–Schwab type L CM showed improvement after corrective fusion using LLIF. Although the difference was not statistically significant, CM improved in 69.6% (16/23 patients) of patients with Obeid type 1A type but only 16.7% (1/6 patients) of those with Obeid type 2A type (p = 0.056). CM was more likely to remain after anteroposterior staged surgery using LLIF in patients with preoperative Obeid type 2A ASD.

Background The common manual measurement technique of spinal sagittal alignment on X-rays is susceptible to rater-dependent variability, which has not been adequately considered in previous publications. This study investigates the effect of those variations in the characterization of patients receiving lumbar spondylodesis. Methods General alignment parameters on pre- and postoperative X-rays were evaluated by four raters in 43 prospectively sampled patients undergoing monolevel spondylodesis. The Intra-class Correlation Coefficient (ICC) for each rater pair and all raters together was calculated for inter-rater reliability. For the operation-induced change of the sagittal alignment in every patient the Wilcoxon test was applied to compare for each rater separately. Results The ICCs were “good” (>0.75) to “excellent” (>0.9) for all raters together and for 45 of the 48 single rater pairs (93.75%). All revealed a significant increase of the addressed segmental lordosis and disc height and no significant change for spinopelvic parameters and sagittal vertical axis from pre- to postoperative. The lumbar lordosis showed a significant increase through the operation of +2.5° (p = 0.014) and +3.7° (p = 0.015) in two raters and no difference for the other ones (+2.1°, p = 0.171; -2.2°, p = 0.522). Conclusions The pre- to postoperative change of lumbar lordosis revealed different significance levels for different raters, although the ICCs were formally good. Accordingly, the evaluation by only one rater would lead to different conclusions. Due to this susceptibility of alignment measurements to rater-dependent variability, the exact evaluation process should be described in every publication and the consistency of significant results be validated through multiple raters. Trials registration The trial was approved by the local ethics committee and listed at the national clinical trials register (DRKS00004514, date of registration: 08/11/2012).

Background Standing whole spinal radiographs are used to evaluate spinal alignment in adult spinal deformity (ASD), yet some studies have reported that pelvic incidence, pelvic tilt, and thoracic kyphosis (TK) intra- and inter-observer reliability is low. This study aimed to evaluate the accuracy of spinopelvic parameters through comparing standing whole spinal radiographs and upright CT images. Methods We enrolled 26 patients with ASD. All standing whole spinal posterior/anterior and lateral radiographs and upright whole spinal CT had been obtained in a natural standing position. Two examiners independently measured 13 radiographic parameters. Interclass correlation coefficients (ICCs) were used to analyze measurement intra- and inter-observer reliability. Paired t- and Pearson’s correlation tests were used to analyze validity of the standing whole spinal radiographs. Results ICCs of upright CT were excellent in both intra- and inter-observer reliability. However, intra-observer ICCs for TK2–12, TK1–5, TK2–5, and TK5–12 on standing lateral radiographs were relatively low, as were inter-observer ICCs for TK2–12, TK1–5, TK2–5, and TK5–12. Concerning TK values, the difference between the radiographs and CT in TK1–12 and TK2–12 were 4.4 ± 3.1 and 6.6 ± 4.6, respectively, and TK values from T2 showed greater measurement error (p Conclusions Upright CT showed excellent intra- and inter-observer reliability in the measurement of spinopelvic parameters. Measurement of TK with T2 on standing whole spinal radiographs resulted in a greater measurement error of up to 6.6°. Surgeons need to consider this when planning surgery and measuring postoperative TK changes in patients with ASD.

Background. Spondylolisthesis is the forward slippage of the upper to the lower vertebrae, which affects spinal cord. Spinal fusion is an important method for the stability of the spine leading to pain and disability reduction in patients with chronic low back pain in spondylolisthesis. The aim of this study was to evaluate postoperative changes in spinopelvic parameters, pain, and disability in low-grade spondylolisthesis patients undergoing posterior lateral fusion (PLF) and posterior lateral interbody fusion (PLIF). Materials and methods. In the present study, 68 patients who underwent PLF and PLIF due to low-grade spon-dylolisthesis were recruited. The spinopelvic parameters, visual analogue scale (VAS) score and Oswestry disability index (ODI) before and after surgery were compared. Results. Pelvic tilt (PT) decreased in both groups after surgery, with more significant decline in PLIF group. More-over, the mean of PT returned to normal value at both groups. There was also a significant decline in both VAS score and ODI parameters between the two groups. There was a correlation between VAS score and postoperative PT changes. However, the pelvic incidence, lumbar lordosis (PI-LL) and VAS score index did not differ significantly between the two groups after surgery. Conclusion. Both PLF and PLIF in low-grade spondylolisthesis patients are useful in restoring PT and pelvic sta-bility, but there is no significant difference in the postoperative pain and disability of patients in the two methods.

Objective Low back pain is the most common reason for physician visit in Western population. It's one of the factors that affect health-related quality of life. Intervertebral disc degeneration is one of the leading factors for low back pain and disc degeneration needs serious attention. In this article, we try to summarize biomechanical factors on the degenerative process. Methods Patients with low back pain in Neurosurgery Department between January 2012 and June 2019 are searched for this study. The patients were gathered under 2 groups; surgical intervention and conservative treatment groups. Intervertebral disc degeneration was assessed by Pfirrmann grading system. All spinopelvic parameters were measured by using standardized lateral plain standing lumbar radiographs. Results There were 165 patients in the surgical group (60 females, 105 males) and 84 patients in the conservative group (57 females, 27 males) after randomization. One hundred fifty patients had microdiscectomy and 15 patients had spinal instrumentation with transforaminal lumbar interbody fusion. There was not a statistically significant difference between surgical intervention and conservative treatment groups when comparing disc degeneration status. There was a statistically significant difference in parameters lumbar lordosis (LL), L4-S1, and pelvic incidence-LL (PI-LL) between the 2 treatment groups. In the surgical group when we further analyze the spinopelvic parameters in between the 2 different surgical techniques; L4-S1, pelvic tilt, and PI-LL showed a statistically significant difference. Conclusion Degenerative disc disease is related with multiple factors which can be detailed under the mechanic components and the genetic components. Of these factors, spinopelvic parameters seem highly penetrating to patients' surgery needs with degenerative disc disease independently.

Objective: This study aimed to evaluate lumbopelvic stability, lumbopelvic mobility, and spinopelvic parameters in patients with lumbar disc hernia (LDH). Materials and Methods: The study included 20 patients with LDH who met the study inclusion criteria and 20 age and gender-matched healthy volunteers. All the subjects were evaluated using a visual analog scale for pain intensity assessment, trunk flexor, and right/left lateral trunk flexor muscle endurance tests and Sorensen tests for lumbopelvic stability, Schober and sit-and-reach tests for lumbopelvic mobility, lateral radiography for spinopelvic parameters and the Oswestry Disability Index for physical functionality. Results: There was a significant difference between the groups with respect to lumbopelvic stability, lumbopelvic mobility, lumbosacral angle, pain, and physical functionality (p

SUMMARY OBJECTIVE: This study aimed to investigate the effect of an adaptive seating system on pelvic obliquity and spinal coronal/sagittal balance in children with nonambulatory cerebral palsy and scoliosis. METHODS: This was a single-blind, prospective, randomized interventional study. Nonambulatory children aged 6–15 years with cerebral palsy and scoliosis were included. The seating system was used for 4 h/day, and exercises were performed 3 days/week for 12 weeks. The Cobb angle, spinopelvic parameters, pelvic obliquity, Reimer's migration index, and Sitting Assessment Scale were measured before and after treatments. RESULTS: A total of 29 participants were randomized into two groups, namely, the seating system+exercise group (SSE-group; n=15) and the exercise group (E-group; n=14). There was no significant change in Cobb angle and Reimer's migration index for both hips in SSE-group, but there was a significant increase in E-group (p=0.002, 0.049, and 0.003, respectively). The sagittal vertical axis, pelvic incidence, and pelvic obliquity decreased in SSE-group. However, there was no difference in the other sagittal parameters and Sitting Assessment Scale-total scores among groups. CONCLUSION: The adaptive seating system was found to be superior in reducing the progression of Cobb angle and hip subluxation/dislocation, decreasing pelvic obliquity, and improving the sagittal balance of the spine/pelvis compared with exercise therapy.

Background Adult spinal deformities (ASD) represent a growing clinical condition related to chronic pain, disability and reduction in quality of life (QoL). A strong correlation among spinal alignment, spinopelvic parameters and QoL after spinal fusion surgery in ASD patients was thoroughly investigated over the last decade, However, only few studies focused on the relationship between lumbo-pelvic-femoral parameters - such as Femoral Obliquity Angle (FOA), T1 Pelvic Angle (TPA) and QoL. Methods Radiological and clinical data from 43 patients surgically treated with thoracolumbar posterior spinal fusion for ASD between 2015 and 2018 were retrospectively analyzed. The primary outcomes were the correlation between preoperative spino-pelvic-femoral parameters and postoperative clinical, functional outcomes and QoL. Secondary outcomes were: changes in sagittal radiographic parameters spino-pelvic-femoral, clinical and functional outcomes and the rate of complications after surgery. Results Using Spearman’s rank correlation coefficients, spinopelvic femoral parameters (FOA, TPA, pre and post-operative) are directly statistically correlated to the quality of life (ODI, SRS-22, pre and post-operative; > 0,6 strong correlation, p p Conclusion Based on our results, preoperative FOA and TPA could be important prognostic parameters for predicting disability and quality of life after spinal surgery in ASD patients and early indicators of possible spinal sagittal malalignment. FOA and TPA, like other and better known spinopelvic parameters, should always be considered when planning corrective surgery in ASD patients.

Total hip arthroplasty (THA) for patients with hip osteoarthritis improves hip flexion contracture, subsequently improving spinal sagittal balance. However, in some cases, spinal sagittal imbalance develops in the course after THA, and its risk factors remain unknown. We aimed to investigate the risk factors of progressive spinal sagittal imbalance after THA. This retrospective cohort study of a prospectively maintained database included female patients aged ≥50 years who underwent THA. Before performing THA, we obtained each patient’s anthropometric and muscle strength measurements and whole-spine radiographs. Three years postoperatively, patients underwent whole-spine radiography to examine changes in the spinal sagittal balance. Patients were assigned into groups on the basis of their preoperative and 3 year postoperative sagittal vertical axis (SVA) values. Patients with 3 year postoperative SVA values ≥40 mm with an increase ≥30 mm were categorized into the imbalance group; the other patients were categorized into the non-imbalance group. Of 103 patients, 11 (10.7%) were in the imbalance group. In multiple logistic regression analysis, preoperative weak abdominal trunk muscle strength (ATMS) (p = 0.007) and small sacral slope (SS) (p = 0.005) were significant risk factors for progressive spinal sagittal imbalance. In conclusion, risk factors for progressive spinal sagittal imbalance after THA were weak preoperative ATMS and small SS.

Background To date, there is a paucity of reports clarifying the change of spinopelvic parameters in patients with adult spinal deformity (ASD) who underwent long segment spinal fusion using iliac screw (IS) and S2-alar-iliac screw (S2AI) fixation. Methods A retrospective review of consecutive patients who underwent deformity correction surgery for ASD between 2013 and 2017 was performed. Patients were divided into two groups based on whether IS or S2AI fixation was performed. All radiographic parameters were measured preoperatively, immediately postoperatively, and the last follow-up. Demographics, intraoperative and clinical data were analyzed between the two groups. Additionally, the cohort was subdivided according to the postoperative change in pelvic incidence (PI): subgroup (C) was defined as change in PI ≥5° and subgroup (NC) with change Results A total of 142 patients met inclusion criteria: 111 who received IS and 31 received S2AI fixation. The IS group (65.6 ± 26°, 39.8 ± 13.8°) showed a significantly higher change in lumbar lordosis (LL) and upper lumbar lordosis (ULL) than the S2AI group (54.4 ± 17.9°, 30.3 ± 9.9°) (p p p Conclusions Compared with the S2AI technique, the IS technique usable larger cantilever force demonstrated more correction of lumbar lordosis, and possible increase in pelvic incidence. Further study is warranted to clarify the clinical impaction of these results.

Purpose: To analyze the relationships between coronal and sagittal spinopelvic parameters in degenerative lumbar kyphoscoliosis (DLKS). Methods: We enrolled 75 patients with DLKS for a radiographic study between January 2016 and September 2018. Correlations between coronal and sagittal spinopelvic radiographic parameters were analyzed. Then patients were divided into 2 groups: sagittal balanced group (SVA< = 5 cm, 30 patients) and sagittal imbalanced group (SVA >5 cm, 45 patients), and relevant parameters were compared. Results: The Cobb angle and lumbar lordosis of the DLKS patients were 24.87 ± 11.59° and 17.26 ± 12.24°, respectively. The average age was 68 years old (range: 42-82), and the sex ratio was 2.6:1 (female: 54 patients; male: 21 patients). 50 patients (66.7%) located convexity of the curve at left side, while 25 patients (33.3%) at right side. The Cobb angle correlated with LL-TK (r = −0.228, p = 0.049), LL (r = −0.255, p = 0.027) and SS (r = −0.232, p = 0.045). There were significant differences in PI-LL (t = −3.484, P = 0.001), LL-TK (t = 2.354, P = 0.023), PI (t = −3201, P = 0.002) and PT (t = −2.521, P = 0.014) between sagittal balanced and imbalanced group. Conclusions: In degenerative lumbar kyphoscoliosis, there are some correlations between coronal and sagittal spinopelvic parameters. Moreover, PI-LL, LL-TK, PI, PT were significantly different between sagittal balanced and imbalanced DLKS patients.

This is a cross-sectional study. This study aims to describe the characteristics of sacrum vertebrae and spinopelvic parameters among the Indonesian population and compare them with studies from other populations. This study also intends to determine the sexual dimorphism of sacrum vertebrae and find the correlations between spinopelvic parameters. Morphometry of the sacrum is necessary for designing sacral prosthesis and instrumentations. Knowledge of spinopelvic parameters further supports the prosthesis installation procedure to restore the physiological spinal alignment of the patients. However, previous studies showed varied results among different populations. This is the first study to be conducted among the Indonesian population. Morphometric dimensions of sacrum vertebrae and the spinopelvic parameters (pelvic incidence, pelvic tilt, sacral slope, lumbar lordosis) were analyzed using thin-cut (1 mm) computed tomography images in 150 males and 150 females, aged 25 to 50 years without any spinal pathology. Generally, the size of the sacrum vertebrae was greater in males (P

Study Design Retrospective study. Purpose Associations among risk factors related to adjacent segmental disease (ASD) remain unclear. We evaluated the risk factors and segmental lordosis ratio to prevent ASD developing after lumbar spinal fusion. Overview of Literature Risk factors related to ASD development are age, sex, obesity, pre-existing degeneration, number of fusion segments, and decreased postoperative lumbar lordosis (LL). However, the associations among these factors are still unclear and should be clearly identified. Methods We retrospectively reviewed data on 274 patients who underwent lumbar spinal fusion of three segments or below for lumbar degenerative disease from January 2010 to December 2012, with over 5 years of follow-up. Patients with preoperative sagittal vertical axis (SVA) >5 cm were excluded due to sagittal imbalance. A total of 37 patients with ASD and 40 control patients (CTRL) were randomly selected in a similar distribution of matching variables: age, sex, and preoperative degenerative changes. Sex, age, number of fusion segments, radiologic measurements, L4–5–S1/L1–S1 LL ratio, and spinopelvic parameters (pelvic incidence [PI], pelvic tilt [PT], sacral slope [SS], and SVA) were analyzed. Logistic regression was used to analyze the correlation between PI–LL mismatch and L4–5–S1 segmental lordosis rate. Results No significant difference was found between ASDs and CTRL groups regarding age, sex, number of fusion segments, fusion method, and preoperative and postoperative spinopelvic parameters (PI, SS, PT, and LL). However, regarding the L4–5–S1/L1–S1 lordosis ratio, 50% (p=0.045), 60% (p=0.031), 70% (p=0.042), 80% (p=0.023), and 90% (p=0.023) were statistically significant; 10 group, and the difference was statistically significant (p=0.048). Conclusions Patients with a postoperative L4–5–S1/L1–S1 lordosis ratio >50% had less occurrence of ASD. Correcting LL according to PI and physiologic segmental lordosis ratio is important in preventing ASD.

Study Design: Cross sectional database study. Objective: To develop a fully automated artificial intelligence and computer vision pipeline for assisted evaluation of lumbar lordosis. Methods: Lateral lumbar radiographs were used to develop a segmentation neural network (n = 629). After synthetic augmentation, 70% of these radiographs were used for network training, while the remaining 30% were used for hyperparameter optimization. A computer vision algorithm was deployed on the segmented radiographs to calculate lumbar lordosis angles. A test set of radiographs was used to evaluate the validity of the entire pipeline (n = 151). Results: The U-Net segmentation achieved a test dataset dice score of 0.821, an area under the receiver operating curve of 0.914, and an accuracy of 0.862. The computer vision algorithm identified the L1 and S1 vertebrae on 84.1% of the test set with an average speed of 0.14 seconds/radiograph. From the 151 test set radiographs, 50 were randomly chosen for surgeon measurement. When compared with those measurements, our algorithm achieved a mean absolute error of 8.055° and a median absolute error of 6.965° (not statistically significant, P > .05). Conclusion: This study is the first to use artificial intelligence and computer vision in a combined pipeline to rapidly measure a sagittal spinopelvic parameter without prior manual surgeon input. The pipeline measures angles with no statistically significant differences from manual measurements by surgeons. This pipeline offers clinical utility in an assistive capacity, and future work should focus on improving segmentation network performance.

Objective:Spinopelvic parameters were identified and the association between sagittal spinopelvic alignment and lumbar disc diseases have been reported in several studies. The purpose of this study was to evaluate the spinopelvic parameters such as lumbar lordosis (LL) and sacral slope (SS) in normal healthy lumbar spine versus degenerative disc disease group.Methods:We retrospectively identified 140 patients suffered from back pain with/without radiculopathy between 2016-2017 in this study. Of these 70 patients had normal disc morphology and they constituted called control group, and the other 70 patients had lumbar degenerative disc disease and they constituted called disease patient group. All patients’ LL, and SS angles were measured on T2 weighted sagittal magnetic resonance imaging and degenerated disc levels were noted. We also recorded LL-SS ratio which was calculated by dividing of LL by SSLL divided by SS value as LL-SS ratio in both groups. We compared these parameters between two groups.Results:In disease patient group there was a positive correlation (r=0.947, p

This was a cross-sectional, observational study.The main objectives of this study were to observe the prevalence of a true L6 among patients with symptomatic adult spinal degeneration, and to evaluate similarities of their radiographic spinopelvic parameters to L5 patients.Spinopelvic parameter values used for diagnosis and surgical planning are different between individuals with 5 or 6 lumbar vertebrae. The difference has not been studied in patients with symptomatic spinal degenerative conditions.A total of 775 consecutive symptomatic patients with degenerative spinal disorders were classified as having 5 or 6 lumbar vertebrae in full spine radiographs. Pelvic incidence minus lumbar lordosis (PI-LL), sagittal vertical axis (SVA), pelvic tilt, and T1 pelvic angle were measured in 3 groups: sacral (L5 and L6s) and L6 upper endplate (L6e). Oswestry Disability Index (ODI) was obtained.In total, 715 (92.3%) patients had L5 and 60 (7.7%) had L6. LL values were comparable between the L5 and L6s (P=0.355) and SVA between all groups (P=0.869). Only SVA had excellent concordance correlation (ρc=0.91) between the L6s and L6e groups. PI-LL had significantly different values (P0.001 all groups) and distributions between L5 and L6s (P=0.038), and L6s and L6e (P0.001) groups. In patients with severe disability (ODI40%) the parameters that deteriorate with increasing degeneration (pelvic tilt, T1 pelvic angle, SVA, LL, PI-LL) were not significantly different between L5 and L6s groups unlike patients with ODI40% while PI remained similarly different (P0.001). PI and LL had a multivariate relationship in L6 patients computable as regression model equation: PI (sacrum)=-0.92×LL (L6e)+0.91×LL (sacrum) +1.11×PI (L6e)+10.81 (R=0.88).L6 variant is fairly common. The radiographic L6 parameters were different from L5 except for SVA and values of patients with severe disability measured from sacrum. PI and LL have a mathematic relationship in L6 patients. The cutoff values for radiographic modifiers need further studies combining radiology and clinical outcome.Level III.

Background: Most of the literature on role of spinopelvic parameters in various lumbar spine pathologies has been based on studies done on Caucasian population. Aims and Objectives: The present study attempts to establish a database of measurements of the sagittal profile of spine in asymptomatic Indian population and their comparison with subjects having various lumbar spine pathologies. Materials and Methods: We performed a prospective case control study at All India Institute of Medical Sciences, New Delhi in which we enrolled 109 patients and 22 healthy asymptomatic subjects in 2 years from 2015 to 2017. All patients underwent standing lateral radiographs of the pelvis and the entire spine and various spino-pelvic parameters were measured using Surgimap software. Results: The mean Pelvic incidence (PI) in the asymptomatic individuals was 49.29 ± 5.95° which was significantly lower when compared with patients of chronic low backache (53.96 ± 9.47, P

Objective To evaluate radiographic parameters of sagittal and spinopelvic alignment in patients with hip osteoarthritis (OA) undergoing primary total hip arthroplasty (THA) to define the primary surgical approach in individuals with concomitant spinal and hip joint disease. Methods Longitudinal, prospective, comparative study with 27 patients undergoing THA and 43 subjects without OA. Results An association between hip and spine degenerative disease in patients with OA was noted. After THA, radiographic parameters of pelvic tilt angle, sagittal vertical axis (EVS) and seventh cervical vertebra/sacrofemoral distance (C7/DSF) ratio were similar to values from volunteers without joint disease. Global coronal alignment (ACG), sagittal alignment, spinopelvic T1 and T9 tilts (IT1EP and IT9EP), sacral tilt (IS), pelvic version (VP), pelvic type and lumbopelvic complex (CLP) did not change after THA. Conclusion Among the sagittal and spinopelvic alignment parameters evaluated, the pelvic tilt angle, the EVS, and the C7/DSF ratio were corrected after THA and can guide the surgeon in the decision-making process for patients with concomitant spinal and hip joint disease. Spinal deformity may compensate for hip changes. Resumo Objetivo Avaliar os parâmetros radiográficos do alinhamento sagital e espinopélvico de pacientes com osteoartrite (OA) de quadril submetidos à artroplastia total de quadril (ATQ) primária, com o intuito de definir a abordagem cirúrgica primária em pacientes com doença concomitante na coluna vertebral e na articulação do quadril. Métodos Estudo longitudinal, prospectivo, comparativo, envolvendo 27 pacientes submetidos à ATQ e 43 indivíduos sem OA. Resultados Foi observada associação entre doença degenerativa no quadril e na coluna nos pacientes com OA. Após a ATQ, os parâmetros radiográficos do ângulo da báscula da bacia, do eixo vertical sagital (EVS) e da razão de C7/DSF (sétima vértebra cervical/distância sacrofemoral) foram semelhantes aos valores dos voluntários sem doença articular. O alinhamento coronal global (ACG), o alinhamento sagital, as inclinações T1 e T9 espinopélvicas (IT1EP e IT9EP), a inclinação sacral (IS), a versão pélvica (VP), e o tipo de pelve e do complexo lombopélvico (CLP) não sofreram alteração depois da ATQ. Conclusão Dentre os parâmetros do alinhamento sagital e espinopélvico avaliados, o ângulo da báscula da bacia, o EVS e a razão C7/DSF foram corrigidos após a ATQ e podem orientar o cirurgião na tomada de decisão para pacientes com doença concomitante na coluna vertebral e na articulação do quadril. A deformidade da coluna pode ser compensatória às alterações do quadril.

Background: The Roussouly classification, based on the functional parameter sacral slope (SS), describes the normal sagittal balance in adults and has proved useful for surgery. Reference values in children should be defined, since they are an important treatment target of conservative treatment. Moreover, during growth, there are few correlations between sagittal parameters, and we hypothesize that a new classification based on the anatomical parameter pelvic incidence (PI) could also be useful. We performed a cross-sectional study to identify the reference values for the Roussouly classification during growth and to develop a new classification based on PI in children. Methods: Correlations between sagittal parameters and age were searched in 222 healthy subjects at the first consultation (6–18 years old). A new classification, based on PI, and comprising three types, is defined and compared to the Roussouly classification. Results: With age, correlations among sagittal balance parameters increase, as well as SS and PI, but with different cut-offs. The distribution of Roussouly types do not correspond to that in adulthood; thus, we defined new reference cut-offs. We defined a PI-based classification in three types, not overlapping Roussouly’s. We found a uniform and balanced distribution of cases among the nine possible combinations. Conclusions: In children, we need to use new thresholds for the Roussouly types. The new classification based on PI is correlated with the Roussouly classification, but it is also clearly different. Future studies will determine its validity.

RESUMEN Introducción: La importancia del manejo del dolor lumbar radica en su recurrencia y en las manifestaciones tanto para el paciente como para la sociedad. Se hace necesario establecer qué factores llevan al éxito en términos de dolor y funcionalidad al momento de realizarse una artrodesis lumbar. Materiales y métodos: Se realizó un estudio descriptivo retrospectivo que buscó determinar qué parámetros espinopélvicos de balance sagital y sus valores en términos de incidencia pélvica (PI), inclinación pélvica (PT), inclinación sacra, lordosis lumbar (LL), eje sagital vertical (SVA) y la diferencia entre la PI y LL (PI-LL), pueden tener una potencial relación con desenlaces posquirúrgicos favorables. Se incluyeron 44 pacientes tratados en el Hospital Universitario San Ignacio entre enero de 2016 y diciembre de 2017. Se tomaron en cuenta desenlaces de dolor y funcionalidad en términos la escala visual analógica y el Oswestry Disability Index (ODI). Se realizó un seguimiento prequirúrgico, y 2 posquirúrgicos a los 3 y 6 meses. Debido al tamaño de la muestra, los autores no pudieron encontrar una significancia estadística, sin embargo, los resultados son concordantes con lo publicado anteriormente en el área. Resultados: El mayor cambio porcentual se encontró en el grupo de pacientes que tuvieron una PI-LL > 10° con un aumento del 50 % en el grupo de pacientes con buena funcionalidad (ODI: 0-20). En SVA > 5 cm, el rango de pacientes con una buena funcionalidad tuvo un aumento del 44,6 %. El rango de buena funcionalidad en pacientes con una PT < 20° aumentó 54,1 puntos porcentuales. Conclusiones: En la presente cohorte se encontró que los parámetros radiológicos que condicionaron un mayor cambio porcentual en la funcionalidad de los pacientes después de ser llevados a cirugía de columna fueron: SVA de base > 5 cm y una PI-LL base > 10° y PT < 20°. ABSTRACT Introduction: The importance of lumbar pain management lies in its recurrence and manifestations for both the patient and society. It is necessary to establish what factors lead to success in terms of pain and functionality at the time of a lumbar arthrodesis. Material and methods: A retrospective descriptive study was conducted that sought to determine which spinopelvic parameters and their values in terms of pelvic incidence (PI), pelvic tilt (PT), sacral slope, lumbar lordosis (LL), sagittal vertical axis (SVA), and mismatch (PI-LL) might have a potential relationship with favorable postoperative outcomes. We included 44 patients who underwent MIS spinal approaches in our center between January 2016 to December 2017. Surgical outcomes of pain and functionality were assessed using visual analogue scale and Oswestry Disability Index (ODI). Follow up was conducted through three evaluations: one before surgical intervention and 2 at 3 and 6 months postop. Due to the sample size, the authors were unable to get statistically significant results. Results: In our descriptive retrospective study on 44 patients, we found a big positive functional change in the group of patients who had a PI-LL > 10° with an increase of 50 percentage points in the group of patients with good functionality (ODI: 0-20). In SVA > 5 cm, the range of patients with good functionality had an increase of 44.6 percentage points. The range of good functionality in patients with a PT < 20° increased 54.1 percentage points. Conclusions: In the present cohort, it was found that the radiological parameters that conditioned a greater percentage change in the functionality of the patients after being taken to spine surgery were SVA of base > 5 cm and a PI-LL base > 10° and PT < 20°.

Purpose: To evaluate the clinical, functional and radiographic outcomes of transforaminal lumbar interbody fusion (TLIF) in degenerative low-grade spondylolisthesis. Materials and Methods: A prospective observational study of 120 consecutive patients (M:F = 24:96) with spondylolisthesis operated with TLIF. Clinical and functional outcome was assessed on Visual analogue Scale (VAS) and Oswestry Disability Index(ODI). The radiological outcome was assessed on sagittal alignment at a specific level, radiologic bony fusion/non-union, intervertebral disc heights and percentage of a slip in relation to the endplate. Clinical and radiological data were collected and analysed. Results: The mean age was 50.97 years. The average follow-up was 14.5 months (12 to 18 months). Mean preoperative ODI was 38.73 and postoperatively 21.30. Analysing the radiological fusion with clinical scores, poorer radiological fusion grades correlated with higher VAS scores for pain. 70% of patients achieved >50% reduction in pain and 60% achieved > 30% reduction in ODI. Pelvic incidence (PI), pelvic tilt (PT), sacral slope (SS) and lumbar lordosis (LL) were significantly greater in spondylolisthesis. PI, PT, and SS did not change statistically from the baseline postoperatively but increased LL and Segmental LL (P

The aim of the present study was to identify whether lumbar spinal subtypes (LSS) were associated with lumbar disc degeneration (LDD) among asymptomatic middle-aged and aged subjects. A cohort of 158 asymptomatic Chinese adults aged >40 years was recruited and 97 volunteers that met the inclusion criteria with complete information available were selected for inclusion. According to spinal morphology, volunteers were divided into four subtypes based on the classification of Roussouly. After baseline information was collected and spinopelvic parameters were measured, the data were compared among the four groups. According to the Pfirrmann classification, the degree of LDD was evaluated at each level on the MRI. For grades I-V, LDD at each level was effectively compared. Each of the four LSS from I to IV according to Roussouly classification from types I to IV were comprised of 25 (25.8%), 19 (19.6%), 38 (39.2%) and 15 (15.5%) of volunteers, respectively. Lumbar lordosis, sacral slope and pelvic incidence were significantly different among the four sub-types (P

Background Few studies describe thoracolumbar disc herniation (TLDH) as an isolated category, it is frequently classified as the lower thoracic spine or upper lumbar spine. Thus, less is known about the morphology and aetiology of TLDH compared to lumbar disc herniation (LDH). The aim of study is to investigate sagittal alignment in TLDH and analyze sagittal profile with radiographic parameters. Methods Data from 70 patients diagnosed with TLDH were retrospectively reviewed. The thoracic-lumbar alignment was depicted by description of curvatures (the apex of lumbar curvature, the apex of thoracic curvature, and inflexion point of the two curvatures) and radiographic parameters from complete standing long-cassette spine radiographs. The rank sum test was utilised to compare radiographic parameter values in each subtype. Results We found two subtypes differentiated by the apex of thoracic kyphotic curves. The sagittal profile was similar to that of the normal population in type I, presenting the apex of the thoracic kyphotic curve located in the middle thoracic spine. The well aligned thoracic-lumbar curve was disrupted in type II, presenting the apex of the thoracic kyphotic curve located in the thoracolumbar region in type II patients. Thirty-six patients were classified as type I, and 34 patients were classified as type II. The mean sagittal vertical axis, T1 pelvic angle and L1 pelvic angle were 27.9 ± 24.8°, 8.2 ± 7.3° and 6.2 ± 4.9°, respectively. There was significant difference (p Conclusions We presented two distinctive sagittal profiles in TLDH patients, and a regional kyphotic deformity with a balanced spine was validated in both subtypes. In type I patients, disc degeneration was accelerated by regional kyphosis in the thoracolumbar junction and eventually caused disc herniation. In type II patients, excessive mechanical stress was directly loaded at the top of the curve (thoracolumbar apex region) rather than being diverted by an arc as in a normal population or type I patients. Mismatch between shape and sacral slope value was observed, and better agreement was found in Type II patients.

Introduction Proximal junctional kyphosis (PJK) is an acute complication of adult spinal deformity (ASD) surgery and may require re-operation because of proximal junctional failure (PJF). PJK causes and prevention strategies remain unknown. This study aimed to investigate the differences in the backgrounds of patients with PJK, compared to those without PJK, in ASD surgery. Methods We included data from 86 patients who underwent ASD surgery between 2012 and 2018. There were 40 patients (46.5%) with PJK; 46 patients did not have PJK until the last follow-up. We evaluated patient demographics, clinical outcomes, and radiographic parameters, such as Cobb angle and spinopelvic parameters on standing X-ray films, in each group. Results There was no significant difference in patient demographics, clinical outcomes, or preoperative radiographic parameters. Postoperative pelvic incidence minus lumbar lordosis (PI-LL) and pelvic tilt (PT) were significantly lower in the PJK group, and thoracic kyphosis (TK) was higher. The cutoff values were 34.5° for TK, 0.5° for PI-LL, and 15.5° for PT. Other radiographic parameters were not significantly different. PJF developed in seven patients (17.5%) in the PJK group. PJF patients had significantly older age, higher postoperative TK, higher postoperative proximal junctional Cobb angle (PJA), more changes between pre- and postoperative PJA, and lower satisfaction scores on the Scoliosis Research Society Outcomes Questionnaire (SRS-22 satisfaction) than non-PJF patients in the PJK group. Conclusions One risk factor for PJK was lower postoperative PI-LL that was 0° or less. In ASD surgery, the most critical factor in a PJK prevention strategy is to obtain a postoperative LL adjusted by PI, which is >0°.

Background: Sacro-pelvic morphology and orientation are usually described in terms of pelvic incidence (PI), pelvic tilt (PT), and sacral slope (SS). Orientation and morphology of pelvis can affect degenerative changes in the lumbar spine. Thus, here we investigated the relationships between various sagittal spinopelvic parameters and the degree of disc degeneration in young adults. Material and Methods: A hospital-based cross-sectional study with a total of 60 cases was done. Patients presenting with back or leg pain having prolapsed disc on magnetic resonance imaging (MRI) were included in the study. A standing X-ray of LS spine from dorso-lumbar junction to mid-thigh was taken. Various spinopelvic parameters were assessed from the scannogram using the software. Results: The mean age was 39.27 years. L5S1 was the most common level. Mean SS, PT, PI, and LL were 37.78°, 13.52°, 51.33°, and 41.01°. Disc pathologies at L1L2, L2L3, and L4L5 level showed a positive correlation with PT, PI, and LL. Disc pathology at the L5S1 level shows a positive correlation with PT and LL. A statistically significant correlation between SS and degenerative spondylolisthesis at L4L5 was found from data with P = 0.023. Discussion: An increase in SS statistically significantly increases the chance of development of degenerative spondylolisthesis at L4L5. An increase in PT, PI, and LL will cause an increase in disc pathology at L1L2. An increase in SS, PT, PI, and LL will cause an increase in disc pathology at L2L3. An increase in SS, PT, PI, and LL will cause an increase in disc pathology at L4L5. An increase in PT and LL will cause an increase in disc pathology at L5S1. Conclusion: Standing lateral view radiograph from dorso-lumbar junction to the mid-thigh is as good as standing whole spine radiograph for measurement of spinopelvic parameters. Degenerative spondylolisthesis at L4L5 has a statistically significant correlation with an increase in SS.

Aim: Bone mineral density (BMD) generally assesses fracture risk in the elderly but is not included in assessment of vertebral fracture status. In this study we aimed to investigate spinal alignment and pelvic orientation in patients with osteoporosis and identify indicators of vertebral fractures (VFs).Methods: Seventy patients above 50 years of age with osteoporosis were included in this retrospective cohort study. Patients were allocated to two groups comprising 29 patients with and 41 patients without VFs. Demographic and clinical characteristics and back pain scores evaluated by Visual Analogue Scale were obtained by scanning patient files. Sagittal vertebral axis (SVA), spinal and pelvic parameters were evaluated with lateral radiography. All parameters and their effect of VFs were compared in both groups. Results: Femoral neck BMD, sacral slope, lumbar lordosis, and pain scores were significantly different in patients with and without VFs (P=0.016, P=0.032, P=0.010, P50 mm and pain scores were predictors of VFs according to results of logistic regression. Conclusion: The spinal deformity in patients with osteoporosis may be explained by the spinal parameters. In our study, we concluded that pain and sagittal imbalance in osteoporosis patients are important parameters for vertebral fractures., Amaç: Kemik mineral yoğunluğu (KMY) genellikle yaşlı bireylerin kırık riski değerlendirmesini gösterir ancak vertebral kırık durumunun değerlendirilmesini içermez. Biz bu çalışmada osteoporozlu hastalarda spinal sagital denge bozukluğu ve pelvik uyum bozukluklarını araştırmayı ve vertebral kırıkların (VK) tahmini göstergelerini tanımlamayı amaçladık.Yöntemler: Bu retrospektif kohort çalışmada 50 yaş üzeri 70 osteoporoz hastası dahil edildi. Hastalar vertebral kırıkları olan; 29 VK(+) ve olmayan; 41 VK(-) olmak üzere iki gruba ayrıldı. Demografik ve klinik özellikler ile Görsel Analog Skala ile ölçülen sırt ağrısı skorları dosya taraması yolu ile elde edildi. Lateral radyolojik inceleme ile sagital vertebral aks (SVA), spinal ve pelvik parametreler değerlendirildi. Tüm parametreler her iki grupta da karşılaştırıldı ve bu parametrelerin VK üzerindeki etkisi analiz edildi.Bulgular: Vertebral kırığı olan ve olmayan hastalarda femur boynu KMY, sakral eğim, lomber lordoz ve ağrı skorlarının anlamlı derecede farklı olduğu bulundu (sırasıyla P=0.016, P=0.032, P=0.010, P50 mm ve ağrı skorları VK’ın belirleyicileriydi.Sonuç: Osteoporozlu hastalarda omurga deformitesi omurga parametreleriyle açıklanabilir. Çalışmamızda osteoporoz hastalarında ağrı ve sagital dengesizliğin, vertebral kırıkların göstergeleri olduğu sonucuna varıldı.

RESUMEN Introducción: La importancia del manejo del dolor lumbar radica en su recurrencia y en las manifestaciones tanto para el paciente como para la sociedad. Se hace necesario establecer qué factores llevan al éxito en términos de dolor y funcionalidad al momento de realizarse una artrodesis lumbar. Materiales y métodos: Se realizó un estudio descriptivo retrospectivo que buscó determinar qué parámetros espinopélvicos de balance sagital y sus valores en términos de incidencia pélvica (PI), inclinación pélvica (PT), inclinación sacra, lordosis lumbar (LL), eje sagital vertical (SVA) y la diferencia entre la PI y LL (PI-LL), pueden tener una potencial relación con desenlaces posquirúrgicos favorables. Se incluyeron 44 pacientes tratados en el Hospital Universitario San Ignacio entre enero de 2016 y diciembre de 2017. Se tomaron en cuenta desenlaces de dolor y funcionalidad en términos la escala visual analógica y el Oswestry Disability Index (ODI). Se realizó un seguimiento prequirúrgico, y 2 posquirúrgicos a los 3 y 6 meses. Debido al tamaño de la muestra, los autores no pudieron encontrar una significancia estadística, sin embargo, los resultados son concordantes con lo publicado anteriormente en el área. Resultados: El mayor cambio porcentual se encontró en el grupo de pacientes que tuvieron una PI-LL > 10° con un aumento del 50 % en el grupo de pacientes con buena funcionalidad (ODI: 0-20). En SVA > 5 cm, el rango de pacientes con una buena funcionalidad tuvo un aumento del 44,6 %. El rango de buena funcionalidad en pacientes con una PT < 20° aumentó 54,1 puntos porcentuales. Conclusiones: En la presente cohorte se encontró que los parámetros radiológicos que condicionaron un mayor cambio porcentual en la funcionalidad de los pacientes después de ser llevados a cirugía de columna fueron: SVA de base > 5 cm y una PI-LL base > 10° y PT < 20°. ABSTRACT Introduction: The importance of lumbar pain management lies in its recurrence and manifestations for both the patient and society. It is necessary to establish what factors lead to success in terms of pain and functionality at the time of a lumbar arthrodesis. Material and methods: A retrospective descriptive study was conducted that sought to determine which spinopelvic parameters and their values in terms of pelvic incidence (PI), pelvic tilt (PT), sacral slope, lumbar lordosis (LL), sagittal vertical axis (SVA), and mismatch (PI-LL) might have a potential relationship with favorable postoperative outcomes. We included 44 patients who underwent MIS spinal approaches in our center between January 2016 to December 2017. Surgical outcomes of pain and functionality were assessed using visual analogue scale and Oswestry Disability Index (ODI). Follow up was conducted through three evaluations: one before surgical intervention and 2 at 3 and 6 months postop. Due to the sample size, the authors were unable to get statistically significant results. Results: In our descriptive retrospective study on 44 patients, we found a big positive functional change in the group of patients who had a PI-LL > 10° with an increase of 50 percentage points in the group of patients with good functionality (ODI: 0-20). In SVA > 5 cm, the range of patients with good functionality had an increase of 44.6 percentage points. The range of good functionality in patients with a PT < 20° increased 54.1 percentage points. Conclusions: In the present cohort, it was found that the radiological parameters that conditioned a greater percentage change in the functionality of the patients after being taken to spine surgery were SVA of base > 5 cm and a PI-LL base > 10° and PT < 20°.

Introduction. Pedicle subtraction osteotomy (PSO) provides for significant segmental correction of the sagittal balance of the spine. At the same time, the technique is associated with a high risk of complications, with rod fracture at the osteotomy site being the most common. The purpose of this study — to assess the effectiveness of four-rod fixation compared to literature data on standard two-rod fixation in patients undergoing PSO. Materials and Methods. The study is a retrospective analysis of 47 consecutive patients with rigid spinal deformities, who underwent pedicle subtraction osteotomy at the lumbar level. The average age of the patients (33 females and 14 males) was 59.7 years. In all cases spinal fixation carried out using a four-rod construct with additional short rods at the osteotomy site. The minimal postoperative follow-up was 2 years. A detailed analysis of the radiographic data was carried out with calculation of the global sagittal balance and spinopelvic parameters. A detailed assessment of complications in the early and late postoperative periods was also performed. After an exhaustive review of literature, a comparative analysis was made of the four-rod fixation technique with current literature data on the frequency of complications (in particular, rod fractures in the osteotomy zone) after two-rod fixation. Results . In all cases the osteotomy was performed at one level, most often at L3 (49%). The average length of fixation was 9.8 segments. The average angle of segmental correction was 27.1°. In most cases, it was possible to achieve adequate correction of spinopelvic parameters. Among complications, bone resorption around screws was most prevalent (23.4% of cases). Proximal junctional kyphosis occurred in 12.8% of cases, neurologic deficit — in 14.9% of cases, infectious complications — in 10.6% cases. Asymptomatic pseudarthrosis, confirmed by CT data, was observed in 12.8% of patients. Rod fracture at the PSO site and adjacent segments was not observed in any of the cases. Rod fractures of other localization were observed in 10.6% of patients. Conclusion . A ccording to the literature, the frequency of rod fractures at the osteotomy site is the most frequent complication of PSO. The results of this study showed that four-rod fixation in PSO significantly reduces the incidence of pseudarthrosis and rod fracture rate in the long-term follow-up and provides greater control over the process of osteotomy closure.

Purpose: to study the influence of spinopelvic parameters on the risk of sacroiliac joint (SIJ) dysfunction development and prognosis of its treatment in patients with degenerative-dystrophic diseases of lumbosacral spine. Patients and methods. Prospective nonrandomized study included 197 patients: 79 patients with SIJ syndrome verified by the test block (main group) and 118 patients with other causes of low back pain (control group). In the main group the treatment tactics consisted of intraarticular injections of glucocorticosteroids and radiofrequency SIJ denervation. The result was deemed positive when pain intensity reduction made up 50% by Numerical Rating Scale (NRS-11) and/or 20% by Oswestry Disability Index (ODI) with effect preservation for 12 months and more. Pelvic incidence (PI), pelvic tilt (PT), sacral slope (SS) and lumbar lordosis (LL) were measured. PI-LL difference was calculated as well as PT/PI and SS/PI ratio, type of posture by P. Roussouly and leg length discrepancy were assessed.Results. Positive treatment results were achieved in 63 (79.75%) patients from the main group. The comparison of 2 groups showed that the main risk factor was the index of PT/PI ratio the odds ratio 6.39 (95% confidence interval (CI) 2.19-8.33; p=0.021) for the risk of SIJ dysfunction development and 4.1 (95% CI 1.98-5.86; p=0.031) for the negative treatment prognosis with that index threshold of 0.28 and 0.32, respectively.Conclusion. The detected reliable dependence between the retroversion degree and SIJ dysfunction development and treatment prognosis may become the basis for new additional studies

Study DesignRetrospective study (level of evidence: level 3).PurposeThe purpose of this study was to evaluate the clinical and radiological results of the posterior-only approach with pedicle screws for the treatment of Scheuermann's kyphosis (SK).Overview of LiteratureThe correction of SK with instrumentation can be performed using posterior-only or combined anterior-posterior procedures. With the use of all-pedicle screw constructs in spine surgery, the posterior-only approach has become a popular option for the definitive treatment of SK. In a nationwide study involving 2,796 patients, a trend toward posterior-only fusion with lower complication rates was reported.MethodsWe retrospectively reviewed the data of patients who underwent posterior-only correction for SK between January 2005 and May 2013. Patients with a definite diagnosis of SK who fulfilled the minimum follow-up criterion of 24 months were included. The thoracic kyphosis (T5–T12), lumbar lordosis (L1–S1), and thoracolumbar junction (T10–L2) angles were measured from preoperative, postoperative, and last control radiographs. Sagittal balance, thoracic length, thoracic diameter, Voutsinas index and the sacral slope, pelvic tilt, proximal junction kyphosis, and distal junction kyphosis angles were also measured.ResultsForty-five patients underwent surgery for the treatment of SK between 2005 and 2013. After applying the exclusion criteria, 20 patients (18 males and 2 females) with a mean age of 19 years were included. The mean thoracic kyphosis angle was 79.8 degrees preoperatively, 44.6 degrees postoperatively, and 44.9 degrees at the last control. There were statistically significant differences between preoperative and postoperative values in the thoracic kyphosis and lumbar lordosis angles, thoracic length, thoracic diameter, and Voutsinas index (pConclusionsThe clinical and radiological results of the current study suggest that posterior-only fusion is an efficient technique for the treatment of SK.

Introduction: Patient-specific instrumentation is an emerging technology with the promise of a better fit to patient anatomy. With the advent of deformity correction planning software, prefabricated rods can mitigate the need to bend rods in the operating room. Prefabricated rods allow the surgeon to provide a deformity correction closely in line with the surgical plan. Methods: A retrospective chart review was completed, and all patients with Medicrea UNiD rod were included. A minimum of 3 week follow up upright 36-inch lateral radiograph was necessary for analysis. Overall 21 patients had Medicrea UNiD rods placed; four were excluded (one for cervicothoracic fusion, three for incomplete follow up). Pelvic parameters were documented from the preoperative, surgical plan, and postoperative radiographs using Surgimap (Nemaris Inc, NY). The parameters for the rods were based on the surgical plan. Paired t-tests were used to compare the preoperative, surgical plan, and postoperative pelvic parameters. Results: Average lumbar lordosis, pelvic tilt, sacral slope, and sagittal vertical axis in preoperative radiographs were 35.12°, 24.82°, 28.65°, and 65.65 mm, respectively. In postoperative imaging, lumbar lordosis, pelvic tilt, sacral slope, and sagittal vertical axis were 57.00°, 18.00°, 35.71°, and 21.59 mm, respectively. There was a statistically significant difference in pelvic tilt, sacral slope, lumbar lordosis, and sagittal vertical axis between the preoperative film and surgical plan (p < 0.001), whereas no statistically significant difference was found between the surgical plan and postoperative pelvic parameters (p > 0.05). Conclusions: Cases in which prefabricated rods were utilized demonstrated improved spinopelvic alignment. Additionally, there was no statistical difference between the surgical plan and postoperative imaging in terms of pelvic parameters. Future studies are needed to investigate the possible benefits of prefabricated rods.

The aim of our study was to investigate the association between global spinal alignment, spinopelvic parameters, and outcomes of osteoporotic vertebral compression fractures (OVCF). Patients with vertebral compression fractures seen at our hospital between October 2017 and November of 2018 with a bone mineral density (BMD) T-score &lt, &minus, 2.5 were recruited for the study. Surgical intervention was performed after eight weeks of conservative treatment depending on clinical symptoms and the willingness of patients. Spinopelvic and sagittal alignment parameters were compared between patients who had surgery and those that did not. Seventy-nine patients were included in the study. Twenty-five patients (31.6%, mean age: 73.28 &plusmn, 9.78 years) received surgery, and 54 (68.3%, mean age: 73 &plusmn, 8.58 years) conservative treatment only. Pelvic tilt, pelvic incidence, and local kyphotic angle were statistically different between the groups (all p &lt, 0.05). A sagittal vertical axis &ge, 50 mm, distance between the C7 plumb line and the center of the fractured vertebra (DSVA) &ge, 60 mm, pelvic incidence outside of the range of 44 to 62&deg, ), and pelvic tilt &ge, 27&deg, were associted with the need for surgical intervention. Measurement of spinopelvic parameters can predict the need for surgery in patients with OVCF.

Objective : Comparing the effects of magnetically controlled growing rod (MCGR) and traditional growing rod (TGR) techniques on the sagittal plane in the treatment of early-onset scoliosis (EOS). Methods : Twelve patients were operated using dual MCGR technique in one center, while 15 patients were operated using dual TGR technique for EOS in another center. Patients' demographic characteristics, complications and radiological measurements such as cobb angle, thoracic kyphosis, lumbar lordosis, T1-S1 range (mm), proximal junctional angle, distal junctional angle, sagittal balance, coronal balance, pelvic incidence, sacral slope and pelvic tilt were assessed and compared in preoperative, postoperative and last follow-up period. Results : Age and sex distributions were similar in both groups. The mean number of lengthening in the MCGR group was 12 (8-15) and 4.8 (3-7) in the TGR group. Two techniques were shown to be effective in controlling the curvature and in the increase of T1-S1 distance. In TGR group, four patients had rod fractures, six patients had screw pull-out and four patients had an infection, whereas three patients had screw pull-out and one patient had infection complications in the MCGR group. Conclusion : There was no significant difference between the two groups in terms of cobb angle, coronal and sagittal balance and sagittal pelvic parameters. MCGR can cause hypokyphosis and proximal junctional kyphosis in a minimum 2-year follow-up period. The implant-related complications were less in the MCGR group. However, larger case groups and longer follow-up periods are required for the better understanding of the superiority of one method on other in terms of complications. WOS:000484045900010 31484232 Q3

Background There were several reports describing the biomechanics and microstructure of multifidus muscles in patients with lumbar disc herniation. However, correlations between lumbar multifidus muscle atrophy (LMA), spinopelvic parameters, and severity of adult degenerative scoliosis (ADS) have not been investigated. The study evaluated the impact of LMA and spinopelvic parameters on the severity of ADS. Methods One hundred and thirty-two patients with ADS were retrospectively reviewed. Standing whole-spine X-ray was used to evaluate the coronal (coronal Cobb angle, CA; coronal vertical axis, CVA) and sagittal (sagittal vertical axis, SVA; thoracic kyphosis, TK; lumbar lordosis, LL; pelvic incidence, PI; pelvic tilt, PT; sacral slope, SS) parameters. LMA was evaluated on axial T2-weighted magnetic resonance imaging (MRI) at intervertebral levels above and below the vertebra at the apex of the scoliotic curve. Clinical symptoms were evaluated by the Oswestry Disability Index (ODI) and the Japanese Orthopaedic Association (JOA) score. Multiple linear regression was used to assess correlations between LMA, spinopelvic parameters, and severity of scoliosis. Results LL and PT were negatively correlated with CA (P

Objective: The aim of this study is to investigate the relationship between sagittal balance, spinopelvic parameters, bone mineral density, balance, and falls efficacy in postmenopausal osteoporosis patients. Materials and Methods: Forty patients between the ages of 40-80 with a diagnosis of postmenopausal osteoporosis were included in the study. Spinopelvic parameters (sagittal vertical axis (SVA), thoracic kyphosis, lumbar lordosis, pelvic tilt, pelvic incidence, sacral slope) were calculated from spine radiographs. Patients were applied Tinetti Balance and Gait Assessment and Falls Efficacy Scale. Relationship between bone mineral density measurements, clinical parameters, spinopelvic parameters, balance and gait, and falls efficacy were investigated. Results: Mean age of the patients was 63.42 +/- 8.98 and the mean L1-L4 T score was 2.5 +/- 0.68. Statistically significant negative correlation was found between the L1-L4 and L2-L4 vertebrae bone mineral density and T score, and sacral slope. Negative statistical correlations were found between SVA and Tinetti Balance and Gait Assessment balance subtest and total scores. There was no statistically significant relationship with other spinopelvic parameters. There was no significant correlation between SVA and spinopelvic parameters and Falls Efficacy Scale, while a statistically significant negative correlation detected between Falls Efficacy Scale and Tinetti Balance and Gait Assessment balance and gait subtests and total scores. Among the patients with normal, mild and severe deformity sagittal balance, there was statistically significant difference in terms of Tinetti Balance and Gait Assessment balance and gait subtests scores and total scores, while there was no difference with regards to Falls Efficacy Scale. Conclusion: In postmenopausal women with osteoporosis, SVA, sagittal balance parameters, and balance and gait functions were found to be associated.

Background:The orientation of the acetabulum has a fundamental role in impingement and instability of the hip, and the spinopelvic parameters are thought to predict the sagittal orientation of the acetabulum (SOA). However, similar to the acetabular version (axial orientation) and inclination (coronal orientation), the cephalic or caudal orientation of the acetabulum in the sagittal plane, or SOA, may primarily be an intrinsic feature of the acetabulum itself.Purpose:To determine whether the spinopelvic parameters predict the sagittal orientation of the acetabulum in individuals without lumbar deformity.Study Design:Cross-sectional study; Level of evidence, 4.Methods:A retrospective analysis was performed in 89 patients (94 hips; 62 female, 27 male; mean ± SD age, 45.9 ± 15.4 years) without lumbosacral deformity who underwent magnetic resonance arthrogram (MRA) for assessment of hip pain. The SOA was determined in the sagittal cut MRA. A line was drawn at the distal limit of the anterior and posterior acetabular horns longitudinally to the transverse ligament, and the angle between this line and the axial plane represented the SOA. The sacral slope, pelvic incidence, and spinopelvic tilt were determined using a 3-dimensional cursor and the axial, sagittal, and coronal cuts. All MRA studies were performed with the patient in the supine position.Results:The SOA had a mean ± SD cephalic orientation of 18° ± 6.6°. No significant correlation was observed between the SOA and the sacral slope ( r = –0.03; P = .77). A weak correlation was observed between the SOA and the pelvic incidence ( r = 0.22; P = .03) and between the SOA and the spinopelvic tilt ( r = 0.41; P < .01).Conclusion:The SOA cannot be presumed based on the spinopelvic parameter. Similar to the well-known parameters to assess the axial and coronal orientation of the acetabulum, the assessment of the SOA demands acetabular-specific parameters. Additional studies are necessary to assess the SOA in asymptomatic hips, including disparities between genders. Clinically significant values for abnormal SOA of the acetabulum remain to be defined.

Background The subsequent L5-S1 disc degeneration associated with long fusion arthrodesis terminating at L5 in patients with adult scoliosis has been a common concern. However, few studies paid attention to its preoperative predictors, especially in spinopelvic parameters. The purpose of the present study was to clarify the preoperative predictors of subsequent L5-S1 disc degeneration after long fusion arthrodesis terminating at L5 in patients with adult scoliosis on spinopelvic parameters. Methods In this retrospective study, we enrolled 67 patients with adult scoliosis, and the patients were divided into disc degeneration group (DD) and no disc degeneration group (NDD), based on the presence or absence of subsequent L5-S1 disc degeneration. The status of L5-S1 disc was evaluated by a modified version of radiographic classification. Characteristics and spinopelvic parameters of preoperative patients were collected as potential predictors for subsequent lumbosacral disc degeneration after long fusion arthrodesis terminating at L5 in patients with adult scoliosis. Multivariate logistic regression analysis and the receiver operating characteristic curve were used to identify the preoperative predictors, with an adjusted odds ratio (OR) and 95% confidence intervals (CI). Results Thirty-six patients (53.73%) with subsequent L5-S1 disc degeneration were divided into group DD (preoperative score 0.81 ± 0.57, last follow-up score 1.83 ± 0.60, P 4.43 cm (OR = 1.308, 95% CI = 1.036–1.649), and SFD > 5.65 cm (OR = 1.337, 95% CI = 1.041–1.718) showed satisfied accuracy for predicting subsequent L5-S1 disc degeneration. Conclusion The prevalence of the subsequent L5-S1 disc degeneration after long fusion arthrodesis terminating at L5 in patients with adult scoliosis was 57.3% (36 of 67 patients). PI 4.43 cm, and SFD > 5.65 cm were preoperative predictors for the subsequent L5-S1 disc degeneration. More attention should be paid to prevent the L5-S1 disc from degeneration when these preoperative predictors exist, especially with two or more.

BACKGROUND: Minimally invasive transforaminal lumbar interbody fusion (MIS-TLIF) has become a popular method of interbody fusion. Clinical outcomes after single-level MIS-TLIF have been reported, but few studies have focused on the radiologic changes in the segmental parameters of the operated and adjacent segments and in lumbar lordosis. METHODS: From March 2009 to September 2016, 117 patients who underwent a single-level MIS-TLIF surgery for lumbar degenerative disease were enrolled in this retrospective study. The anterior disc height (ADH), posterior disc height (PDH), and segmental angle (SA) of the operated and adjacent levels and lumbar lordosis (LL) were evaluated on radiographs obtained pre- and postoperatively at 6- to 12-month follow-up visits. Cage-related parameters including fusion and subsidence rates were analyzed on postoperative computed tomography scans. Clinical assessment used validated outcome scores such as the Oswestry Disability Index questionnaire and the Odom criteria. RESULTS: ADH and PDH of the operated segment increased significantly after surgery, but no significant changes were seen in the SA of that level. Statistically significant decreases were observed in the PDH of both adjacent segments and increases in the adjacent superior SA. LL showed a slight but statistically significant improvement after surgery that was mostly correlated with a postoperative increase in the adjacent superior SA (r = 0.58; P < 0.001). No significant correlations were found between clinical and radiologic results. CONCLUSIONS: Single-level MIS-TLIF increased disc height but not the SA at the operated level. LL improvement after surgery was mainly associated with the increase of the cranial segmental angle info:eu-repo/semantics/publishedVersion

Study DesignRetrospective analysis of adolescent idiopathic scoliosis.PurposeThis study aimed to investigate the influence of distinct distal fusion levels on spinopelvic parameters in patients with adolescent idiopathic scoliosis (AIS) who underwent posterior instrumentation and fusion surgery.Overview of LiteratureThe distal fusion level selection in treatment of AIS is the one of milestone to effect on surgical outcome. Most of the paper focused on the coronal deformity correction and balance. The literature have lack of knowledge about spinopelvic changing after surgical treatment and the relation with distal fusion level. We evaluate the spinopelvic and pelvic parameter alteration after fusion surgery in treatment of AIS.MethodsA total of 100 patients with AIS (88 females and 12 males) were retrospectively reviewed. Patients were assigned into the following three groups according to the distal fusion level: lumbar 2 (L2), lumbar 3 (L3), and lumbar 4 (L4). Using a lateral plane radiograph of the whole spine, spinopelvic angular parameters such as thoracic kyphosis (TK), lumbar lordosis (LL), pelvic incidence (PI), sacral slope (SS), and pelvic tilt (PT) were radiologically assessed.ResultsThe mean age was 15±2.4 years, and the mean follow-up period was 24.27±11.69 months. Regarding the lowest instrumented vertebra, patients were categorized as follows: 30 patients in L2 (group 1), 40 patients in L3 (group 2), and 30 patients in L4 (group 3). TK decreased from 36.60±13.30 degrees preoperatively to 26.00±7.3 degrees postoperatively in each group (p=0.001). LL decreased from 52.8±9.4 degrees preoperatively to 44.30±7.50 degrees postoperatively (p=0.001). Although PI showed no difference preoperatively among the groups, it was statistically higher postoperatively in group 3 than in the other groups (pp=0.027). SS decreased from 35.20±6.40 degrees preoperatively to 33.40±5.80 degrees postoperatively (p=0.08, p>0.05). However, mean SS was significantly higher in group 3 (p=0.042, pr=0.285; p=0.004, pr=0.365; p=0.001, pConclusionsWhen the distal instrumentation level in AIS surgery is below L3, a significant change in PT and SS (pelvic parameters) is anticipated.

L'espondilolistesi en el mielomeningocele (MMC) ha estat poc estudiada. La bibliografia només recull un article, al Journal of Pediatrics Orthopaedics l'any 1994 de Stanitski, que mostra una prevalença d'espondilolistesi (SPL) similar a la població general. Es creu que el defecte de l’arc posterior en el MMC proporciona les condicions necessàries pel desenvolupament de l’espondilolistesi amb una freqüència superior a la població general. Per aquest motiu es planteja un estudi que constati la seva prevalença i els factors que la predisposen en la població amb MMC de la Unitat d’Espina Bífida de l’Hospital Universitari Vall d’Hebron. METODOLOGIA: Es tracta d’un estudi observacional transversal de 195 pacients amb MMC. S'exclouen altres tipus de disrafisme, els menors de 10 anys, els que no disposin de Rx adequada per valorar els paràmetres raquipelvians, els que tenen escoliosi severa que no permet la valoració de la zona i els intervinguts de raquis. Es valora la incidència pelviana (PI), el pendent sacre (SS), la lordosi lumbar (LL) i la inclinació pelviana (PT) juntament a les ratios derivades i variables clíniques extretes de qüestionari de recollida com ara són: sexe, nivell de raquisquisi, lesió neurològica sobreafegida, flexe de maluc, flexe de genoll, escoliosi, escala de Hoffer, nivell funcional i marxa. RESULTATS: es van analitzar 195 subjeces afectes de MMC amb una distribució per sexes de 55% homes i 45% dones, i una mitjana d'edat de 27,7 anys (10-61). El 87,2% de la mostra presentaven hidrocefàlia, sent derivada en el 82% dels casos. El 19,48% dels pacients presenten una lesió neurològica associada, sent la patologia més freqüentment recollida la siringomièlia. Referent a la marxa, el 69,8% eren deambulants comunitaris mentre que el 30,2% es desplaçaven en cadira de rodes. La mitjana d'adquisició de la marxa va ser de 33 mesos (12-144); la pèrdua de nivell funcional es constata en el 28,96%. El 78% dels pacients tenen el nivell de raquisquisi a L3L4L5. La prevalença d'espondilolistesi en el mielomenigocele és del 20%, sent significativament diferent de la població general (p, The spondylolisthesis in myelomeningocele (MMC) has not been studied so much. In the literature, we can only find an article, in the Journal of Pediatrics Orthopaedics written in 1994 by Stanitski, showing a prevalence of spondylolisthesis (SPL) similar to the general population. It is belived that the defect of the posterior arch in MMC provides the necessary conditions for the development of spondylolisthesis with a higher frequency than in general population. For this reason we propose an study to verify the prevalence and the factors that predispose SPL in a population of MMC in Spina Bifida Unit at the Vall d’Hebron University Hospital. METHODOLOGY: This is a cross-sectional study of 195 patients with MMC. Exclusion criteria: other types of dysraphism, patients under 10 years-old, those without a good Rx for assessing the spinopelvic parameters, those with sever scoliosis and patients with spine surgery. We measured the pelvic incidence (PI), the sacral slope (SS), the lumbar lordosis (LL) and pelvic tilt (PT), with their ratios. Clinical variables such as sex, level of rachischisis, acquired neurological damage, hip flexum, knee flexum, scoliosis, Hoffer scale, functional and walking level, were also analyzed. RESULTS: we analyzed 195 subjects with MMC, 55% male and 45% female, with an average age of 27.7 years-old (10-61). 87.2% of these patients presented hydrocephalus, being derivated in the 82% of cases. 19.48% of them presented acquired neurological damage, being syringomyelia the commonest. 69.8% of them were able to walk while 30.2% were wheelchair users. The average age for walking was 33 months (12-144) and the functional loss was seen in 28.96% of MMC. 78% of patients had the level of rachischisi in L3L4L5. Prevalence of SPL in MMC is 20%, being significantly higher than in general population (p>0.001), in 100% of cases the level was L5S1 and low grade. The slipping average of SPL was 17.8% +/- 6%. Only the variable walking was statistically significant (p=0.030) in clinical variable group. The average of spinopelvic parameters was: PI 63.92º +/-19.8º, PT (seated; standing) 33+/-30; 52+/-17, SS (seated; standing) 33+/-30;10+/-18, LL (seated; standing) 37 +/- 15.5; 59 +/- 20. We found statistical significance between SPL and LL (p=0.013) and a tendency to signification of SS with SPL (p=0.056). Analyzing the walking group, we note that LL and SS values are significantly higher (p=0.001 and p=0.003) in subjects with SPL. CONCLUSIONS: The prevalence of spondylolisthesis is 20% in this population and is related with walking, and an increase of lumbar lordosis (LL) and sacral slope (SS).

Background Recently, a grayscale inversion view was reported to improve intra- and inter-observer reliabilities in measuring coronal curvature with Cobb and pedicle methods in scoliosis patients. However, the grayscale transformation has never been applied to the measurements of spinopelvic parameters. The purpose of this study was to compare the measurement reliabilities of the spinoplevic sagittal parameters between the ‘Standard View’ and the ‘Grayscale Inversion View’ in normal adult populations. Methods A total of 30 asymptomatic subjects aged between 30 and 40 years were included in this study. Whole-spine posteroanterior radiographs were used to measure the spinoplevic sagittal parameters including thoracic kyphosis (TK), lumbar lordosis (LL), sagittal vertical axis (SVA), pelvic incidence (PI), sacral slope (SS) and pelvic tilt (PT) in both standard view and grayscale inversion view. Two independent observers measured the parameters twice at a 2-week interval. Intra- and inter-observer reliabilities were compared between the two radiographic views. The absolute differences between the two sets of measurements on each view were calculated and compared. Results The intra-class correlation coefficients (ICCs) of PI, PT and SVA were greater in the grayscale inversion view than in the standard view (0.972 vs 0.817, 0.937 vs 0.833 and 0.964 vs 0.901 for observer 1, respectively; 0.990 vs 0.826, 0.995 vs 0.842 and 0.969 vs 0.919 for observer 2, respectively). Overall, the improvement of ICC was greater in parameters of sagittal pelvic alignment than in those of sagittal spinal alignment. As for the mean absolute differences between two measurements, significant differences existed between the two views in terms of PI, PT and SVA ( p = 0.014, 0.016 and 0.011 for observer 1, respectively; p = 0.014, 0.025 and 0.046 for observer 2, respectively). Conclusions A grayscale inversion view provided improved intra- and inter-observer reliabilities in measuring spinoplevic alignment when compared with a standard view. This view was more useful in subjects whose pelvic anatomical structures can’t be identified clearly on the standard X-ray view.

Lumbar stenosis is frequently observed and treated by spine surgeons. The extent of neurological decompression and the potential spinal fixation are the basic concerns when surgery is planned. But this segmented approach to the problem is sometimes insufficient due to the complex functional situations induced by a sagittal imbalance of the patient and the combination of pathologies known as hip-spine or knee-spine syndromes. A total of 373 consecutive patients included from our EOS and clinical data base. Patients were divided in two groups. Group A included patients presenting exclusive spinal issues (172 cases) out of whom 117 (68 %) had sagittal imbalance. Among 201 patients with associated lower limbs issues (group B), 122 (61 %) had sagittal imbalance. The perception of imbalance was noticed in 54 % (93 cases) in group A and 57 % (115 cases) in group B. In the global series of 239 imbalanced cases, the key point was a spine issue for 165 patients (the 117 patients with only spine problems and 48/122 cases with combined spine and lower limbs problems). But in the patients with combined spine and lower limbs problems, we individualized hip-spine syndromes (24/122 patients) and knee-spine syndromes (13/122 patients). In some cases, (37/122 patients) the anatomical and functional situations were more complex to characterize a spine-hip or a hip-spine problem. The EOS full-body images provide new information regarding the global spinal and lower limbs alignment to improve the understanding of the patient functional posture. This study highlights the importance of the lower limb evaluation not only as compensatory mechanism of the spinal problems but also as an individualized parameter with its own influence on the global balance analysis. Level of evidence IV diagnostic case series.

Introduction: Sagittal imbalance leads to muscular distress and results in low back pain. Objectives: This study scrutinize the segmental impact of short spinal fusion on spinopelvic parameters and the global patient’s clinical outcome. Materials and Methods: A retrospective analysis evaluated 56-patients who underwent lumbar fusion surgery at Klinikum Dortmund, from July 2013 to February 2014. The population was allocated into two groups: (1-level group), (2-levels group). EOS imaging applied for radiological evaluation and measurements of the following spinopelvic parameters: pelvic incidence (PI), sacral slope (SS), pelvic tilt (SS), lumbar lordosis (LL), and sagittal vertical axis (SVA). The radiological measurements were implemented during the preoperative, postoperative, 3 months and 1 year follow-up visits. All patients completed clinical questionnaires. Results: Statistically, the Pearson correlation coefficient revealed in the 1-level group that the clinical parameters correlated with the PT (R=0.40), SSA (R=-0.38) and SVA (R=-0.41) (p

Purpose: To analyze changes in sagittal spinopelvic parameters (SSPs) after surgical treatment of Scheuermann’s Kyphosis (SK). Methods: We analyzed 20 patients affected by SK and subjected to posterior correction of the kyphosis by facetectomy, Ponte osteotomy, fusion and multilevel instrumentation with pedicle screw system. Four spinal and three pelvic parameters were measured: sagittal vertical axis (SVA), thoracic kyphosis (TK), thoracolumbar kyphosis, lumbar lordosis (LL), pelvic incidence (PI), sacral slope (SS) and pelvic tilt (PT). Analysis of changes in postprocedural SSPs compared to preoperative values was performed. Results: TK passed from 78.6° preoperatively to 45.8° (p = 0.003). LL passed from 74.5° preoperatively to 53.5° (p = 0.01). No significant changes occurred in SVA, SS, PT and PI compared to preoperative values. Conclusion: We confirm the positive effect of surgery by Ponte osteotomy and posterior spinal fusion on TK and LL in patients with SK. In our experience, pelvic parameters did not change after surgery.

Eser, Olcay (Balikesir Author), Bu makalede omurgada sagittal dengenin önemi ve sagittal denge ile bağlantılı olan spinopelvik parametrelerden bahsedilmektedir. Omurgadaki sagittal denge ile ilişkili anlatılan parametreler; C7 şakül hattı, ağırlık çizgisi hattı, pelvik insidans, sakral eğim, pelvik eğim açılarıdır. Dejeneratif spondilolistezis, istmik spondilolistezis, lomber disk hernisi, pedikül substraksiyon osteotomi ve posterior lomber interbody füzyon (PLIF) klinik tabloları spinopelvik parametreler eşliğinde değerlendirilmiştir., This article explains the significance of sagittal balance of the spine and spinopelvic parameters associated with sagittal balance of the spine. Here in the parameters related spinal sagittal balance are C7 plumb line, gravity line, pelvic incidence, sacral slope, pelvic tilt angle. Degenerative spondylolisthesis, isthmic spondylolisthesis, lumbar disc herniation, pedicle subtraction osteotomy and posterior lumbar interbody fusion (PLIF) were evaluated as clinical manifestations, with spinopelvic parameters.

Objective To investigate the relationship between bone mineral density (BMD) and sagittal spinal balance in the Korean elderly population. Methods The retrospective study included subjects aged 60 years and above, who had whole-spine lateral radiography and dual-energy X-ray absorptiometry (DEXA) within a year's gap between each other. Sagittal vertical axis (SVA) for evaluation of sagittal spinal balance and five spinopelvic parameters were measured through radiography. The presence of compression fracture was identified. Correlations of BMD T-scores with SVA and with the spinopelvic parameters were assessed using Pearson correlation coefficient (PCC). Linear regression analyses were performed between SVA and the clinical and radiologic variables. Results One hundred twenty-two subjects (42 males and 80 females; mean age, 69.93±5.5 years) were included in the study. BMD, femur or spine, was not correlated with SVA or any spinopelvic parameters in both genders (PCC