The achilles tendon is the strongest tendon in the body and is approximately the same diameter as your little finger.  It connects your calf muscles to your heel bone (calcaneus) and works to transmit forces generated by your calf muscles to push your foot down at the ankle joint (known as dorsi-flexion).  A functional achilles tendon is critical in all sports and general day to day life to permit activity like standing, walking, running and jumping.

Injuries to the achilles tendon are common and include achilles tendonitis, achilles tendonosis, and complete or partial ruptures.