Isolated dislocation of the tarsal navicular.

An unusual case of isolated dorsal dislocation of the tarsal navicular bone due to hyperextension of the foot is presented. The treatment was closed reduction with percutaneous fixation with a Kirschner wire and immobilization for 8 weeks. The end result was satisfactory. To prevent redislocation leading to arthritis, the Kirschner wire should be left in place for at least 6 months.