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Objective. To analyze clinical and radiological results of corrective fusion in the lumbar spine in the treatment of patients with sagittal imbalance after previous surgical interventions. Material and Methods. A retrospective monocentric study, clinical case series. The data of 18 patients operated on using a combination of surgical methods with obligatory anterior corrective fusion at the L4–L5 and/or L5–S1 levels to achieve optimal parameters of the sagittal balance disturbed or developed after previous interventions were analyzed. Clinical and radiological parameters were assessed during hospital stay and at least 10 months later. Results. The study presents data from 3 (16.7 %) men and 15 (83.3 %) women with an average age of 57.5 ± 9.1 years. Average length of hospital stay was 26.9 ± 10.1 days. In 7 (38.9 %) cases, the deformity occurred at the previously operated level and in 11 (61.1 %) – at the adjacent one. The duration of surgery was 481.4 ± 101.7 minutes, and blood loss was 1028.9 ± 594.9 ml. Back and leg pain VAS scores decreased in 10–19 months after surgery from 6.4 ± 0.9 and 4.8 ± 1.3 to 3.2 ± 1.2 and 0.9 ± 0.8, respectively (p < 0.001). The ODI score decreased from 59.6 ± 5.9 to 39.9 ± 7.7 (p < 0.001). The ideal Roussouly type was restored in 11 (61.1 %) cases, below ideal – in 3 (16.7 %), and overcorrection – in 4 (22.2 %). LL increased from 48.1 ± 13.6 ° to 56.9 ± 11.6 ° (p < 0.001), and LDI – from 40.1 ± 16.9 to 58.8 ± 10.3 (p

Objective. To analyze the nearest clinical and radiological results of simultaneous and staged surgical treatment of patients with degenerative sagittal imbalance. Material and Methods. Retrospective monocentric cohort study included analysis of data from 54 patients who underwent simultaneous combination of surgical methods with obligatory corrective anterior fusion at the L4–L5 or at L4–L5 and L5–S1 levels (Group I, n = 27) or similar surgical intervention though divided into stages with an interval of 5 days or more (Group II, n = 27). A comparison of clinical, radiological, and operational data during inpatient treatment was carried out. Results. The duration of surgery was 410.93 ± 76.34 minutes in Group I and 594.63 ± 102.61 minutes in Group II (p = 0.000001); the blood loss was 926.67 ± 378.63 ml versus 1345.19 ± 522.97 ml, respectively (p = 0.001575). Postoperative clinical and radiological parameters did not differ between groups: VAS back (p = 0.248647), VAS leg (p = 0.196140), PT (p = 0.115965), SVA (p = 0.208449), LL (p = 0.023654), LDI (p = 0.931646), PI-LL (p = 0.693045), GAP (p = 0.823504), and restoration of the ideal Russoly type (p = 0.111476). The incidence of perioperative complications in groups was comparable: 17 (62.96 %) in Group I and 15 (55.56 %) in Group II (p = 0.583171). Patients with a high Charlson comorbidity index had a significantly higher incidence of complications (p = 0.023471). The index of surgical invasiveness in Group I had a significant correlation with the total number of complications (= 0.421332). Conclusion. Clinical and radiological results and the incidence of complications are comparable between single- and multistage approaches to correct sagittal balance disorders. In staged treatment, the total duration of surgery and the volume of blood loss are significantly higher. With a high Charlson comorbidity index and Mirza surgical invasiveness index, a multistage approach to the treatment of patients with sagittal imbalance is preferred.

Objective. To analyze the early clinical and radiological outcomes of lumbar spine fusion in patients with degenerative sagittal imbalance. Material and Methods. The data of 45 patients who were operated on sequentially using a combination of surgical methods for vertebrogenic pain syndrome and (or) neurological deficit and who had a violation of the sagittal balance of degenerative origin were analyzed. All patients underwent anterior spinal fusion at the L4–L5, L5–S1 levels to correct and restore lower lumbar lordosis. The next stage was decompression through posterior approach, if necessary supplemented by interbody fusion at clinically significant lumbar levels above the L4–L5 segment. In all patients, surgical treatment was completed with screw transpedicular fixation at the levels of interbody fusion. Demographic, clinical and surgical data, and radiological parameters were evaluated. Results. The study included data from 6 men and 39 women with an average age of 58.9 ± 7.8 years. Duration of hospital stay was 27.1 ± 7.4 days. The primary surgery was performed in 33 (73.3 %) patients, and the reoperation for pain recurrence after previous surgery at the same lumbar level – in 12 (26.7 %) patients. The duration of surgery was 529.8 ± 117.8 min, the blood loss was 1130.4 ± 560.1 ml. Back and leg pain VAS score decreased after surgery from 6.7 ± 0.9 and 4.7 ± 1.4 to 3.3 ± 0.9 and 0.5 ± 0.6, respectively (p < 0.001). The ideal sagittal type according the Russoly’s classification was restored in 27 (60 %) cases, that below the ideal – in 9 (20 %), and hypercorrection was in 9 (20 %). PT decreased from 26.1° ± 5.7° to 17.4° ± 3.9° (p < 0.001) and SVA – from 6.7 ± 3.5 to 2.7 ± 2.3 cm (p < 0.001). LL increased from 36.3° ± 18.5° to 55.1° ± 11.8° (p < 0.001) and Low LL – from 13.5° ± 9.8° to 37.9° ± 8.2° (p < 0.001). According to GAP, the number of patients with severe and moderate imbalance was reduced (p < 0.001). Surgical complications were observed in 26 (57.7 %) patients. Conclusion. The multi-stage surgical treatment of patients with degenerative spinal deformities using corrective fusion in the lumbar spine significantly improves parameters of the spinopelvic and global sagittal balances in the early postoperative period.