A complex joint between the lower leg and the hind cannon bone of the horse. The joint consists of 4 levels; the tarsocrural joint between the tibia and the talus is a hinge joint with a large range of movement in one plane, the other levels consist of the small hock joints (the proximal and distal intertarsal joint and the tarso-metatarsal joint). The small hock joints have an extremely limited range of movement.