[Bipolar dislocation of the first metatarsal bone].

Simultaneous dislocation of the first cuneometatarsal joint and metatarsophalangeal joint is a rare injury. The case of a 22-year-old man is reported, but no previous cases have been reported in the literature. The treatment by closed reduction and pinning was very classical. Occasionally the reducibility of the metatarsophalangeal joint may be made more difficult by the interposition of a sesamoid bone. The simultaneous dislocation occurred because the injury was very severe. After 2 years, the function and mobility of the toe were normal, but radiographs revealed modifications of the Lisfranc joint.