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Popliteal snapping syndrome
77%
512/664
Patellar clunk syndrome
9%
63/664
Subluxation secondary to a tight posterior cruciate ligament
6%
37/664
Soft-tissue irritation secondary to retained polymethylmethacrylate
5%
31/664
Patellar subluxation secondary to a tight lateral retinaculum
3%
17/664
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Popliteal snapping syndrome represents the most likely diagnosis. Barnes and Scott noted that the popliteus tendon can be a potential source of internal derangement after total knee arthroplasty. They noted that it can be subluxated anteriorly and posteriorly over a retained lateral femoral condyle osteophyte. Allardyce and associates described the condition as a popliteus condition, snapping as it rolls over a retained lateral femoral condylar osteophyte. Patellar clunk syndrome is a distinct syndrome associated with the patella and has been reported in posterior stabilized knees. In addition to crepitation with range of motion, the patella literally snaps or jumps as the knee is taken from flexion to extension.
2.9
(8)
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