The Probert Encyclopaedia of Medicine

CALCANEUM

In human anatomy, the calcaneum or calcaneus bone, is the largest and strongest of the tarsal bones. It projects backwards beyond the bones of the leg to provide a lever for the muscles of the calf, and forms the lower, outer part of the ankle and extends downward to form the heel. It is responsible for bearing much of the immediate stress placed upon the foot during walking.
Research Calcaneum