In synovial chondromatosis, foci of metaplastic cartilage form in the synovial membrane of a joint. These foci may grow, become detached from the synovial membrane and enter thejoint cavity as loose bodies. Calcification or ossification of the cartilage masses may occur (Jaffe 1958). As far as we know no cases of synovial chondromatosis with a familial pattern have been reported. We describe a family in which three men are affected.