Post-traumatic giant intraarticular synovial osteochondroma of the knee

Abstract

Secondary synovial chondromatosis is a well-recognised cause of intraarticular loose bodies of the knee joint. Although usually associated with degenerative arthritis of the adjacent joint surfaces, the phenomenon is less common following trauma. In addition, giant lesions from any cause are rarely seen in the knee joint. We describe a giant synovial osteochondroma measuring 7.5×5×4 cm following a football injury in which an osteochondral fracture of the medial femoral condyle occurred. The lesion was confirmed arthroscopically, but arthrotomy was required to remove it.