The Achilles tendon represents a very important structure in human locomotion. Pathologic afflictions of this tendon may lead to serious problems if not recognized and treated appropriately. Drs. Reinherz, Granoff, and Westerfield briefly review normal tendon anatomy and function. The mechanisms of tendon injury with clinical recognition of pathology, both objective and subjective, are then discussed. Proper management of the compromised tendo Achillis is presented.