The anatomy of the first metatarso-phalangealjoint and of dorsal dislocation of the phalanx are described. As with similar lesions in the hand, closed reduction is impossible because of interposition of the volar plate. Open reduction is essential and should be performed as soon as possible after the injury.

1. Three patients with enchondromata of the metacarpal bones are described.

2. The nature of the enchondromata in all three patients was confirmed by histological examination.

3. Treatment was by radical excision and bridging of the gap by a cortical bone graft.

4. There has been no impairment of function in the hands. No patient complained of pain after the operation.

5. Radiographs taken one year after operation in two patients showed that the flat bone grafts had become cylindrical and that medullary canals had appeared.