Patellar osteochondritis dissecans

Case contributed by Dr Henry Knipe

Presentation

Knee pain for months.

Patient Data

Age: 15 years
Gender: Male

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. 

Case Discussion

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. 

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Case information

rID: 59815
Published: 26th Apr 2018
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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