Microsurgical carpal tunnel release.
The author reports on a series of 482 patients who underwent primary carpal tunnel release (CTR) surgery beginning in 1987. Two hundred twenty-five patients underwent CTR in the right hand, 169 patients underwent CTR in the left hand, and 88 patients underwent bilateral CTR surgery, for a total of 570 hands. These surgeries were performed on an outpatient basis. After application of a local anesthetic, a microsurgical technique using a 2-cm longitudinal incision that did not cross the wrist flexion crease was accomplished. In five patients the recurrent thenar branch exited through the middle or ulnar portion of the ligament and this branch was preserved in all five. Perioperative complications included stitch abscesses in nine hands (2%), which were managed on an outpatient basis; deep wound infections occurred in three hands (0.5%) and these patients were admitted for intravenous antibiotic administration and wound care. One steroid-dependent patient suffered wound dehiscence due to a fall and the wound was primarily repaired. One patient required a second minor procedure to remove a retained suture. Two patients developed "trigger finger" 6 months postoperatively. The mean time until return to work for those patients not receiving Workers' Compensation was 3 weeks and for those receiving Workers' Compensation it was 6.5 weeks. Complete disappearance of painful dysesthesias occurred in 431 (89%) of 482 patients. Marked improvement occurred in another 33 (7%) patients, yielding an overall improvement rate of 96%. Motor improvement was noted in 438 (96%) of 454 patients with preoperative motor weakness. Bilateral symptoms resolved on the contralateral side following unilateral surgery in seven patients. Fifteen patients (12 of whom were receiving Workers' Compensation) experienced persistent dysesthesias and/or incision pain and did not return to work. An additional eight procedures were performed in patients who had previously undergone surgery at another institution; four showed no evidence of their transverse carpal ligament being sectioned. Five of the eight patients undergoing reexploration noted postoperative improvement in their symptoms. Finally, 14 (3%) patients presented 1 to 5 years postsurgery with thenar/hypothenar pain. These patients have responded to local steroid injections and are being followed by a hand surgeon. The reimbursement of the surgeon's fee is 253.00 dollars from Medicaid, 360.00 dollars from Medicare, and 560.00 dollars from preferred provider insurance. The mean total time in the outpatient operating room is 35 to 40 minutes. The outcome and time to return to work are equal, if not superior, to those reported for endoscopic CTR surgery. Microsurgical CTR is thought to be safer and probably more cost-effective.
Shapiro
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Section of Neurosurgery, Indiana University Medical Center, Indianapolis, Indiana 46202, USA.