A case of simple lateral rotatory dislocation of the ankle without fracture is reported. No similar case has been found in the English literature. The mechanism of injury is a minor inversion type of injury. There is no roentgenographic evidence of tibiofibular diastasis.
Treatment consisted in closed reduction followed by a below-the-knee non-weight-bearing plaster cast for six weeks.
A good anatomical, roentgenographic, and functional result was obtained.