Trigger finger and trigger thumb are sometimes called stenosing tenosynovitis. Tenosynovitis is inflammation of a tendon in ...

A sheath, called the synovial membrane ... When this occurs in the finger joints, people also call it “trigger finger,” but it can affect any finger joint. Tendons are cord-like structures ...

Structures called pulleys keep the tendon sheath in place along the finger bones. Trigger finger develops when the pulleys become inflamed. This makes it difficult for the tendon to slide through ...