Knee Extension Lag Treated with Posterior Capsulotomy of the Knee: A Case Report and Review of the Literature

Introduction: The posterior capsule of the knee plays an important role in maintaining the integrity of the knee joint. Pathologies involving the posterior capsule have been implicated in developing flexion contractures. Posterior capsulotomy is a well-studied modality for this issue, performed through either an open or arthroscopic approach. Case Report: A 74-year-old Caucasian male presented with a complex extensor lag of his right knee and an inability to gain full extension either actively or passively. Through the use of standard knee arthroscopy, the authors were able to not only correct his posterior capsular pathology but also address anterior knee lesions. Only the combination of both allowed a full extension of the joint. Conclusion: Posterior capsulotomy of the knee may be carried out successfully and safely through either an open or arthroscopic approach. Arthroscopic capsulotomy is proposed as a safer, minimally invasive option that has been gaining recent favor compared to open approaches. Keywords: Posterior capsulotomy, arthroscopy, extensor lag, knee.