Bilateral ruptures of the extensor mechanism of the knee: A systematic review.

Introduction: We conduct a systematic and qualitative review of the current literature to evaluate studies that described bilateral ruptures of the extensor mechanism of the knee. Methods: A comprehensive literature search was performed to evaluate all studies included in the literature until September 2016. Results: Fourteen studies with a total of 44 patients met the inclusion criteria. There were 14 patients with CRF (61%), 6 patients were affected by diabetes mellitus (14%) while other 6 patients were obese patients (14%). Conclusion: CRF represents the most frequent comorbidity in patients with bilateral quadriceps/patellar tendon ruptures.