Trigger finger: the effect of partial release of the first annular pulley on triggering.

A prospective, randomized study was performed on 19 patients, in whom the proximal, middle, or distal third of the first annular pulley was divided to determine if a specific portion of the first annular pulley was responsible for the clinical triggering associated with restrictive flexor tenosynovitis. In all 19 patients, a partial resection of the first annular pulley resulted in continued clinical triggering with active digital flexion. At this point, a standard complete first annular pulley release was performed, with resolution of clinical triggering of the involved digit in all patients. We conclude that there is no "critical third" of the first annular pulley responsible for clinical digital triggering.