Overview Achilles tendinitis. Achilles tendonitis is inflammation of the Achilles tendon, the largest tendon in the body, which runs from the calf to the heel bone. Noninsertional Achilles tendonitis affects fibers in the middle of the ten…

Overview A tendon is a band of connective tissue that anchors muscle to bone. The Achilles tendon is the largest tendon in the body. It attaches the calf muscles to the heel bone (calcaneus) and is very important because it lets you lift y…