Abstract
Subchondral bone cysts are commonly noted in radiographs of joints of persons with haemophilia. Articular chondral integrity is partially dependent upon a trans-osseal blood supply. Bone cysts disrupt this physiological pathway. Ensuing chondrolysis may expose the cyst contents to the joint cavity. This article reports upon the clinical and radiological improvement in a child with a subchondral bone cyst of the talus which was surgically treated. One may hypothesise regarding the connection between “open” chondral cysts and chronic intra-articular synovitis which leads to the frequently noted osteoarthropathy.
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