A Study of Ruptures of the Lateral Ligament of the Ankle Joint (Clinical Experience and Cadaver Studies)

This sutdy reports the normal value of the ankle stress roentgenogram in 20 volunteers after a lateral and ventral maximum pressure of 15 KP by the Scheuba-Fixation device. The results of talar tilt angle of supination inversion stress test is 2 degrees, and talofibular gap is 5.4mm. The results of posterior hiatus of lateral sagittal stress test is 5.5mm and talotibia length is 38mm. Those data can be served as basic clinical documentation. We also report on a biomechanical study of cadavers; (10 cadacers, 20 ankles), All cadavers were divided into two groups. Group I follows a complete rupture of anterior talofibular ligament (ATF) with additional division of the rest lateral ligaments. The results demonstrated that roentgenogram of ankle joint may increased by supplementary division of lateral ligament. However, group II isolated division of two different lateal ligaments under intact anterior talofibular ligament (ATF) demonstrated that realease of calcaneofibular or posterior talofibular ligaments cannot be visualized in stress film. Therefore, results of cadaver study indicate that anterior talofibular ligament play a very important role in ankle joint stability.