Ankles support weight of the body.
Their tridimensional motion plane is sagittal. Constraints are very high. Talus, distal tibia and the medial malleolus delimits the joint. Articular capsule and ligaments give stability. Muscles and their aponeuroses provide the movement.
Foot architecture is sometimes represented as the model of a torsion bar. There are three main contact points (posterior, anteromedial and anterolateral). These points are connected by two arches (internal and external).