A complete tear in the Achilles tendon is known as an Achilles tendon rupture. The Achilles tendon, which is also known as the heel cord, connects the large calf muscles (Gasctrocnemius and Soleus) to the heel bone (calcaneus) and is essential for proper functioning of the calf muscles. The calf muscles are required for pushing the foot downward and are necessary for walking, running, and jumping.