Updated September 30, 2014.

Definition:

The Achilles tendon, sometimes more formally called the calcaneal tendon, attaches the muscles of the calf (soleus, gastrocnemius and plantaris) to the heel bone (calcaneus).

It is one of the longest tendons in the body and it helps us push off the ground with the front of the foot as in walking or running. (Tendons attach muscles to bone and ligaments attach bones to bones.)

"The Achilles," as it is known colloquially in sporting circles, is susceptible to serious injury when it tears.

This is called an Achilles rupture. It may be a partial or complete rupture. Often a pop or cracking noise can be heard at the instant of the tear.

While athletes in heavy training and competition are susceptible to Achilles tendon tears, many injuries occur in middle-aged athletes attempting to exercise without progressively building up their physical fitness.