Patellar osteochondritis dissecans
Knee pain for months.
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Small knee joint effusion.
Osteochondral lesion of the inferior aspect of the medial patellar facet with a full-thickness chondral defect, subchondral plate irregularity and marrow edema throughout the medial aspect of the patella. Femoral trochlea is normal.
Normal menisci, collateral ligaments and cruciate ligaments.
The patella is a less common site for osteochondritis dissecans (OCD) of the knee. Perhaps, the only potential differential diagnosis is a dorsal defect of the patella, which occur in the superolateral aspect of the patella, whereas OCD more commonly occurs in the inferomedial aspect of the patella with abnormal articular cartilage.