Note: This case has been tagged as "legacy" as it no longer meets image preparation and/or other case publication guidelines.
From the case:
Osteochondral defect with intra-articular loose bodies
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A large osteochondral defect is present involving the articular surface of the medial femoral condyle with fragments seen within the joint.
Case Discussion
Typical appearances of an osteochondral defect. In such cases, a careful search for the loose fragment should be undertaken, cognisant that there may be multiple fragments (as in this case).