Definition
1) Definition: A trigger finger/thumb is a condition where the movement of the affected digit is arrested for a moment while flexed or extended and then continues with a jerk upon continued effort. This is a result of thickening and constriction of the mouth of the fibrous tendon sheath through which the affected tendon travels. This interferes with the normal free gliding of the flexor tendon contained within the thickened sheath. The tendon develops a swollen area as a result of the constriction which prevents it from smoothly moving through the tendon sheath. The condition most commonly occurs in the ring or middle fingers, and most commonly affects the fingers of middle-aged women and the thumb in infants or small children. It has been known to cause disability in long-standing diabetic patients.
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