A complete tear in the tendon. A tendon can rupture when the muscle to which it is attached contracts unexpectedly and powerfully, such as during vigorous exercise. Rupture can also be the result of an injury or joint disorder such as rheumatoid arthritis.
Symptoms include impaired movement, snapping sensation, swelling, and pain. Diagnosis is often obvious from the symptoms by themselves. Surgery to fix the tendon can be necessary. In certain cases, the tendon can heal if immobilized in a plaster cast.