The Achilles tendon is a thick rope-like cord attaching the heel to the lower leg. It can be strained, partially or completely ruptured, and overused. When it ruptures, you cannot rise up on your toes---and you will likely know something is wrong.

Partial Rupture

A partial rupture of the Achilles tendon may feel painful, or it may not, with swelling or discomfort when a specific point is touched. You may even think you have a sprained ankle, or experience soreness and weakness, especially during activity.

Complete Rupture

A complete rupture will feel much different from a partial tear---it's like being hit or kicked in the leg. It hurts immediately, and then the pain disappears as quickly as it came. You might hear a sound like a rubber band snapping at the time of the tear. Your affected foot will feel weak.

Strain

A strain to the Achilles tendon is relatively common, especially during sport activities, bringing pain, inflammation and tenderness. Depending on the strain's severity, it may be treated as a rupture.

Tendinitis

Achilles tendinitis comes from a swollen tendon due to overuse. You will feel widespread ankle pain or point-tenderness, achiness, weakness, and limited or stiff movement. Tendinitis can lead to a partial or full rupture to the Achilles tendon.

Rupture Management

If you suspect any type of Achilles tendon injury, get off your feet and seek medical attention right away. For a full tear, surgery may be the best course of action.

Source:

American Academy of Family Physicians: Common Conditions of the Achilles Tendon

"Principles of Athletic Training;" Daniel D. Arnheim and William E. Prentice; 1993

AchillesTendon.com: Everything about Achilles Tendons

More Information:

AchillesTendonRupture.com: Achilles Tendon Rupture Information