A tendon may rupture when the muscle to which it is attached contracts suddenly and powerfully, such as during vigorous exercise.
Rupture may also be due to an injury or joint disorder such as rheumatoid arthritis.
Symptoms include a snapping sensation, impaired movement, pain, and swelling.
Diagnosis is usually obvious from the symptoms.
Surgery to repair the tendon may be needed.
In some cases, the tendon may heal if immobilized in a plaster cast.