Ultrasound-guided release of carpal tunnel syndrome - anterograde technique.

Abstract

Compression of the median nerve in the carpal tunnel is a frequent pathology with severe functional impact. An ultrasound-guided technique was developed to preserve structures, diminish scar fibrosis and enable fast return to full activity. Its advantages are safety and low additional cost. Ultrasound-guided carpal tunnel release is indicated in moderate and severe carpal tunnel syndrome persisting after conservative treatment. A preoperative ultrasound scan is recommended to evaluate anatomy. Recurrent carpal tunnel syndrome, secondary carpal tunnel syndrome and anatomic variants compromising the safety of transverse carpal ligament division are contraindications. The procedure is performed under local anesthesia without tourniquet. The entry point is a short transverse incision proximal to the wrist crease. The transverse carpal ligament is divided anterogradely, using a dedicated blade under ultrasound control, making sure no nerves, tendons or blood vessels are injured. The final step is to check that the division is complete. Early return to use of the hand is permitted. Reports of similar techniques demonstrated early symptomatic relieve, favorable patient-reported outcome measures from within 1 week after surgery to 2 years' follow-up, with early return to normal daily activity and work. The complications rate is low: many series showed no complications. Comparative studies between ultrasound-guided carpal tunnel release and the mini-open technique reported similar or greater and quicker symptom relief, less scar pain and better strength. Final functional results tend to be similar.