Abstract
We report herein a rare case of lateral parapatellar synovial plica that developed simultaneously in both knees. A 15-year-old competitive soccer player visited our institution with a six-month history of anterolateral pain and catching sensation in both knee joints. On physical examination, he complained of tenderness along the joint line of bilateral patellofemoral joint (PFJ). Visible and palpable popping was observed at the lateral margin of each patella during active knee motion. Magnetic resonance imaging showed obvious synovial soft nodules in the lateral side of the PFJ. On arthroscopy, a yellowish, thick, tongue-shaped tissue extending transversely from the lateral parapatellar synovium was identified in both knees, and parts of this tissue showed avascular hypertrophy. Arthroscopic findings of both knees are almost symmetrical in anatomical location, but no similar in size. After arthroscopic excision, the patient became asymptomatic. At 24-month follow up, he demonstrated full knee function, without evidence of local recurrence.
Highlights
Synovial plica or fold is some of the normal structures of the knee joint cavity, and is basically asymptomatic
We report a rare case of lateral parapatellar synovial plica that developed simultaneously in both knees
Bilateral symptomatic lateral parapatellar plica occurring simultaneously during the adolescent growth period is not found reported in the literature
Summary
Synovial plica or fold is some of the normal structures of the knee joint cavity, and is basically asymptomatic. When synovial plica loses their normal elasticity and becomes fibrotic, they can be cause of dynamic pathological lesion of the knee. The medial parapatellar plica is most common symptomatic, and little lateral parapatellar plica has been published and is considered a much more rare. H. Kanazawa et al 64 entity (1% to 2%) [1] [2]. Bilateral symptomatic lateral parapatellar plica occurring simultaneously during the adolescent growth period is not found reported in the literature. We present hereinafter a rare case of lateral parapatellar synovial plica involving bilateral patello-femoral joint (PFJ) with restriction of sports activity and severe pain
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