Or the tendon may thicken, making movement of the fingers, hands or arms difficult. Without sufficient time to heal, the tendon may be permanently weakened. Tenosynovitis refers to the inflammation of the synovial sheath caused by repetitive motion. This injury can be quite painful and tendon movement may become restricted due to the swelling of the sheath. If the sheath or tendon becomes scarred, tenosynovitis can cause permanent damage.
Ganglionic Cysts are another tendon sheath condition.
The sheath swells up with synovial fluid and causes a bump under the skin, often on the wrist. Ganglionic cysts may be a symptom of tenosynovitis. Nine tendons for flexing your fingers, along with the median nerve, pass from the forearm to the hand through a passage in your wrist called the carpal tunnel. Figure 2 CTS results when the median nerve is compressed, either from the swelling of tendons and sheaths or from repeated bending of the wrist. Symptoms include numbness, tingling, and pain in the side of your hand that goes from the thumb to the inside of your ring finger.