[Congenital round talus].

The collective consists of 11 patients with a "ball and socket"-anomaly of the talus with a mean age of 13.7 years. All patients demonstrated typical symptoms of the FFU-syndrome with a leg length discrepancy of 4.3 cm (2-20). In 6 patients a close follow-up was done in the early development of the talus form. In the metacarpal region also synostosis of some bones were seen at a mean age of 4.8 years (3.2-5.9). No clinical complaints but a slight reduction of hind foot mobility could been registered. Ball and socket deformity can not been seen as congenital, but as a subsequent deformity after congenital fusions in the metatarsal bones.