The effect of gravity on the ligaments of the medial malleolus and its pronating effect on the tarsus.

The strethcing effect of the force of gravity on the ligamentous system of the medial malleolus and the tarsus is described, based on biomechanical calculations. Attention is called to the necessity of the complete healing of the injuries of the ligaments and to the prevention of the valgus tendency of the tarsus.