Complications and Radiographic Outcomes of Tibial Tubercle Osteotomy at Minimum 5-Year Follow-up.

Background: Tibial tubercle osteotomy (TTO) is a commonly utilized surgery in the treatment of patellofemoral instability and chondrosis. A number of case series studies have reported on the mid- and long-term outcomes with varying complication rates. Purpose: To report the incidence of major complications after TTO and the rate of progression of knee osteoarthritis at midterm follow-up. Study Design: Case series; Level of evidence, 4. Methods: All patients who underwent primary TTO between January 1, 2010 and December 31, 2015, and who had ≥5 years of clinical follow-up data were included. Patient demographics and clinical and radiographic outcomes were recorded. Risk factors for complications were identified using multivariate logistic regression analysis. Results: A total of 72 patients were included. The mean follow-up period was 104.8 months (range, 67-138 months). The overall complication rate was 38.9% (28/72 patients), and the incidence of major complications was 6.9%. Univariate logistic regression analysis revealed that patients with a history of smoking were more likely to experience a complication (odds ratio = 4.33 [95% CI, 1.29-14.53]; Conclusion: In the current study, TTO was found to have a major complication rate of 6.9% at midterm follow-up. Smoking was a risk factor for major complications. Only 11.9% of patients had progression in tibiofemoral osteoarthritis at midterm follow-up.