Synovial Osteochondromatosis of the Carpometacarpal Joint

Abstract not available. Introduction provided instead.

Synovial osteochondromatosis is an uncommon lesion characterized by cartilagenous and osseous metaplasia of the synovial membrane of the joint and the tendon sheath. It is classically monoarticular, and is found in large joints such as the knees, hips, shoulders, and ankles; it rarely occurs in the small joints of the hand. We present an extremely rare case of synovial osteochondromatosis involving the carpometacarpal joint of the thumb.