The authors investigated the influence of relations between the utile areas of the articular faces in ankle joint in medial twisting of the foot. For their investigation they used the material from the Institute of Anatomy "Drago Perović", Institute of Pathology and Institute for Forensic medicine of the Medical Faculty of Zagreb. Investigations were performed in articular faces of the tibia, fibula and talus on the left and right legs of the adults. Mutual comparing of the joint faces, their areas and altitudes, angles between the medial malleolus and tibia, and the altitudes of the medial and lateral malleolus has shown great individual differences. According to these results the authors concluded that the disproportion of the articular bodies caused habitual medial twisting of the foot. The importance and the role of ligaments, muscles and joint capsule were not the object of this investigation. The obtained results are a contribution to the functional anatomy of the ankle joint, and to the clinical pathology of this region.