Osteochondritis dissecans - knee
Pain and locking of the left knee.
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The MRI sequences demonstrate a well-defined osteochondral defect of the lateral aspect of the medial femoral condyle with underlying edema of the bone marrow of low signal on T1WI, and high signal on PD fat sat.
The detached osteochondral fragment is displaced, seen in the anterior aspect of the intercondylar notch, anterior to the distal ACL of low signal on T1WI, and intermediate signal on PD fat sat.