Achilles Tendon Rupture
The Achilles tendon is the thick cord of fibrous tissue on the back of the ankle, that connects the muscles of the lower leg to the bone on the back of the foot. This lets the calf muscle pull the back if the foot up, pivoting the front of the foot downwards during walking and running. If this tendon is pulled too fast, or beyond its limit of stretch, it can rupture and make it extremely difficult to walk. At the time of the injury, it can sound like a snapping sound, followed by a sharp pain on the back of the ankle coupled with swelling and sore calf muscles.