Tenosynovitis is inflammation of the lining of the sheath that surrounds a tendon (the cord that joins muscle to bone).
Inflammation of the tendon sheath
The synovium is a lining of the protective sheath that covers tendons. Tenosynovitis is inflammation of this sheath. The cause of the inflammation may be unknown, or it may result from:
- Diseases that cause inflammation
The wrists, hands, and feet are commonly affected, because the tendons are long across those joints. But, the condition may occur with any tendon sheath.
An infected cut to the hands or wrists that causes tenosynovitis may be an emergency requiring surgery.