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Background: Patients who underwent knee joint arthroplasty were at risk of venous thromboembolic events (VTEs), however, less studies were conducted to demonstrate the epidemiology and risk factors of deep venous thrombosis (DVT) following unicompartmental knee arthroplasty (UKA). Objective of this study was to explore the incidence and prognostic factors of DVT after UKA. Methods: Patients who underwent primary UKA from December 2018 to June 2022 were recruited in this study. Demographic characteristics, operation related variables and laboratory index were extracted and analyzed. Receiver operating characteristic analysis was performed to detect the optimum cut-off value for variables of interest. Univariate and multivariate logistic analysis were performed to identify risk factors of DVT. Results: 351 UKAs with a mean age of 65.4 ± 7.1 years were reviewed. After 12.9 ± 11.2 months follow-up, 35 DVTs were confirmed which indicating an incidence of 9.9%. The results showed that occupation (agricultural laborer) (P = 0.008), disease duration > 8.5 years (P = 0.035), operation time > 169 min (P = 0.003), intraoperative blood loss > 102 ml (P < 0.001), BMI > 26.8 kg/m 2 (P = 0.001), preoperative D-dimer > 0.29 mg/L (P = 0.001), prothrombin time < 10.7 s (P = 0.033) and INR < 0.98 (P = 0.032) between DVT and Non-DVT group were significantly different. Multivariate logistic regression analysis showed intraoperative blood loss > 102 ml (OR, 3.707; P, 0.001), BMI > 26.8 kg/m 2 (OR, 4.664; P, 0.004) and D-dimer > 0.29 mg/L (OR, 2.882; P, 0.009) were independent risk factors of DVT after UKA. Conclusion: The incidence of DVT in the present study was 9.9%, extensive intraoperative blood loss, advanced BMI and high level of D-dimer would increase the risk of lower extremity thrombosis by 2–4 times. [ABSTRACT FROM AUTHOR]

Medial opening‐wedge high tibial osteotomy (MOWHTO) is a well‐established surgical method for treatment of isolated medial compartment osteoarthritis with varus deformity, but the surgical outcomes may be compromised by surgical site infection (SSI). This study aimed to investigate the incidence and the risk factors for SSI after MOWHTO. This retrospective study included consecutive patients who underwent MOWHTO for isolated medial compartment osteoarthritis with varus deformity in two tertiary referral hospitals from January 2019 and June 2021. Patients who developed SSI within 12 months of surgery were identified by inquiring the medical records for index hospitalisation, notes of after‐discharge outpatient visits, or records of readmission for treatment of SSI. Univariate comparisons were performed to detect the differences between SSI and non‐SSI groups, and multivariate logistic regression analysis was used to identify the independent risk factors. Six hundred sixteen patients with 708 procedures were included and 30 (4.2%) cases of SSI occurred, with 0.6% rate for deep SSI and 3.6% for superficial. Univariate analyses showed significant difference between groups in terms of morbidity obesity (≥32 kg/m2) (20.0% vs 8.9%), comorbid diabetes (26.7% vs 11.1%), active smoking (20.0% vs 6.3%), time from admission to operation (5.2 ± 4.0 vs 4.1 ± 3.0), size of osteotomy ≥12 mm (40.0% vs 20.0%), type of bone grafting and lymphocyte count (2.1 ± 0.5 vs 1.9 ± 0.6). However, in the multivariate analysis, only active smoking (OR, 3.4; 95% CI, 1.4‐10.2), size of osteotomy ≥12 mm (OR, 2.8; 95% CI, 1.3‐5.9) and allogeneic/artificial vs no bone grafting (OR, 2.4; 95% CI, 1.0‐10.8) remained significant. SSI was not uncommon after MOWHTO, but the majority was superficial. The identified three independent factors, including smoking, size of osteotomy ≥12 mm and allogeneic/artificial bone grafting would help risk assessment and stratification, target risk factor modification and clinical surveillance, and inform patient counselling. [ABSTRACT FROM AUTHOR]

Unicompartmental knee arthroplasty (UKA) has been proven as an ideal alternative surgical procedure to treat symptomatic isolated knee osteoarthritis, and recently this technique has gained its popularity. However, postoperative complications would inevitably compromise the effectiveness and patients' satisfaction. The objective of this study is to demonstrate the incidence and risk factors of delayed wound healing (DWH) after UKA. This retrospective cohort study was conducted from February 2021 to May 2022 and a total of 211 patients were enrolled. Demographic characteristics, operation‐related variables, and laboratory indexes were extracted. Receiver operating characteristic analysis was performed to detect the optimum cut‐off value for continuous variables. Univariate and multivariate logistic regression analysis was performed to demonstrate the risk factors of DWH. There were 155 female and 56 male patients with an average age of 64. 6 ± 6.9 years included in this study. After 6.6 ± 4.9 months' follow‐up, 12 cases of DWH were observed which indicated an incidence of DWH of 5.7%, mean wound healing duration for 12 patients was 43.1 ± 19.3 days. In the univariate analysis, age > 62.5 years, postoperative hospital stay < 5.5 days, surgical incision < 10.5 cm, barbed suture, body mass index (BMI) > 32.0 kg/m2, operation duration > 102.5 minutes, intraoperative blood loss > 102.5 mL, preoperative white blood cell count > 5.95*109/L, preoperative seroglobulin (GLB) > 29.6 g/L, postoperative total protein < 63.4 g/L, postoperative serum albumin < 36.4 g/L, and postoperative GLB > 26.8 g/L were significantly different between patients with and without DWH (P <.05). In final multivariate logistic analysis, results showed that intraoperative blood loss > 102.5 mL (odds ratio [OR], 3.09; P =.001), postoperative hospital stay < 5.5 days (OR, 1.74; P =.014), surgical incision < 10.5 cm (OR, 1.67; P =.000), and BMI > 32.0 kg/m2 (OR, 4.47; P =.022) were independent risk factors for DWH. DWH prolongs hospital stay in UKA patients and increases healthcare expenditure; also affected the implementation schedule of postoperative functional exercise plans. Surgeons should identify patients at risk, meanwhile, make timely and correct clinical interventions to decrease the incidence of this complication. [ABSTRACT FROM AUTHOR]