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Figures 57a through 57c show the radiographs of a patient who has pain, discomfort, and a popping sensation localized to the posterior aspect of the knee after undergoing primary left total knee arthroplasty 6 months ago. Examination reveals that the patient is able to ambulate without a limp. There is no significant swelling, erythema, or effusion. Range of motion is 0 degrees to 115 degrees, and a palpable crepitation or snapping is detected at the posterior lateral joint line. What is the most likely diagnosis?
Popliteal snapping syndrome
Patellar clunk syndrome
Subluxation secondary to a tight posterior cruciate ligament
Soft-tissue irritation secondary to retained polymethylmethacrylate
Patellar subluxation secondary to a tight lateral retinaculum
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