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

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.A comprehensive literature search was performed to evaluate all studies included in the literature until September 2016.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%).CRF represents the most frequent comorbidity in patients with bilateral quadriceps/patellar tendon ruptures.