Anterior instability in the ankle joint following acute lateral sprain.

The relation between anterior instability in the ankle joint and rupture of the anterior talofibular ligament was investigated in patients with acute ankle sprains. Various techniques were used to provoke anterior displacement of the talus. The actual condition of the anterior talofibular ligament was assessed at operation. The appropriate radiographic method was defined, and its valve in diagnosing an acute rupture of the anterior talofibular ligament was assessed.