Fracture dislocation of the tarsal navicular with medial column disruption of the foot.

A displaced fracture of the body of the tarsal navicular with isolated disruption of the talonavicular joint is a rare injury. The authors encountered one such injury in which there was no subtalar dislocation and no injury to the calcaneocuboid joint. This injury was believed to be the result of a severe abduction force with the foot in plantar flexion, rather than the previously described medial swivel dislocation, which typically involves the subtalar joint. A case history and brief review of the literature is presented.