Anatomy of the Ankle Joint and Hindfoot

The ankle is a highly congruent synovial, hinge-type joint, in which the talus fits perfectly into the mortise formed by the tibial plateau, and the tibial and fibular malleoli. This anatomical conformation allows movement through only one axis, the bimalleolar axis, through which dorsiflexion and plantarflexion movements are produced. Normal values of the range of motion are 13–33° for dorsiflexion and 23–56° for plantarflexion [1].