Degeneration of a bone just under a joint surface, causing fragments of bone and cartilage to become separated, which may cause the joint to lock. The condition commonly affects the knee and usually starts in adolescence. Symptoms include aching discomfort and intermittent swelling of the affected joint. If a fragment has not completely separated from the bone, the joint may be immobilized in a plaster cast to allow reattachment. Loose bone or cartilage fragments in the knee are removed during arthroscopy. Disruption to the smoothness of the joint surface increases the risk of osteoarthritis.
Osteochondritis dissecans |
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