TRIGGER THUMB AND TRIGGER FINGER

Stenosing tenosynovitis can occur in the thumb or in any finger, and can even occur congenitally, in infants, but is most commonly present in people who either are developing a mild form of arthritis, already have rheumatoid arthritis or another kind of arthritis or have overused the tendon, so that the covering of the tendon has swollen, and gets caught in the pulley system. 

The tenosynovitis most commonly occurs in the ring or middle or long fingers, with inflammation of the metacarpal-phalangeal joint pulley causing a discrepancy between the size of the tendon and pulley. The tendon may become thickened just proximal to the pulley and this discrepancy in size can cause a snapping or locking phenomenon, holding the thumb or finger flexed or extended depending upon when the "nod