Trigger finger (also known as stenosing flexor tenosynovitis) is the term for a finger that cannot easily be extended from a flexed position. Severity ranges from a stiff finger or jerky finger movement to a finger that cannot even be extended when outside force is applied.
Inflammation of the flexor tendon sheath is responsible for a trigger finger, leading to swelling and thus limited mobility. As a rule, the A1 ring band is thickened mechanically.
A mild version of the trigger finger can be treated conservatively with immobilization, anti-inflammatory drugs or a local cortisone injection. If surgical therapy is needed the tendon's entry point is cut open under local anesthesia, which usually leads to a remission of symptoms within a short period of time.
Schulthess Klinik (German)