Introduction Synovial chondromatosis is an uncommon condition of metaplastic focal formation of cartilage in the intimal layer of the synovial membrane. If the cartilage nodules undergo enchondral ossification, the condition is termed osteochondromatosis. Numerous opalescent nodules pepper a thickened synovium, occasionally breaking free to form loose bodies. Clinically, the presentation is one of joint pain and swelling, stiffness, crepitus and mechanical symptoms such as locking. Physical examination may reveal a decreased range of motion, swelling or a soft-tissue mass.
Treatment is principally by synovectomy.
We present a case of truly intra-articular chondromatosis occurring in the metacarpophalangeal joint of the small finger. He did not report any locking of the joint. There was no history of trauma. He was otherwise healthy and no other joints were involved. No evidence of arthritis was noted.