In the embryo, tissue differentiates into synovium and articular cartilage. If hyaline cartilage develops within the synovial membrane at points of reflection, cartilaginous bodies are nourished through the synovial pedicle and deposited into the joint space where they obtain nutrition via synovial fluid. These cartilaginous bodies undergo endochondral ossification. The presence of intra-articular bodies may damage the joint's articular cartilage. Considerable controversy exits as to the nature of these chondral bodies. Apte and Athanasou1 reported the presence of a different antigenic phenotype, while de-Bont et al2 found mature chondrocytes by electron microscopy. Leu et al3 observed an independent chondroid matrix and found basal lamina-like material not found in mature chondrocytes, which they postulated as a prechondroblastic precursor cell responsible for formation of chondromatosis.