The knifelight is a special instrument that allows the surgeon to cut the flexor retinaculum without actually seeing it. The retinaculum is a band of tissue that crosses the wrist. This fibrous band can put pressure on the carpal tunnel causing mild to severe symptoms of carpal tunnel syndrome.

A carpal tunnel release involves cutting the retinaculum in half from bottom to top. Usually an incision must be made to open the wrist so the surgeon can see the retinaculum fully. With a mini-open incision, the bottom edge of the retinaculum shows and the knifelight is used the finish the cut.

With the operating room lights off, the knifelight lights up the middle of the palm when the retinaculum is cut all the way through. Operation and recovery time are shorter with this method.