This procedure involves dividing the ligament that forms the roof of the tunnel. This allows the nerve to pass freely through the tunnel without being compressed.

A tourniquet may be placed over the upper arm to limit bleeding. This will allow a clear, unobstructed view of the nerve.

An incision, about one and a half to two inches long, is made in the palm, usually in the skin crease, extending up to the wrist.

The ligament is exposed and then carefully divided - that is, it is opened along its length, making the median nerve entirely visible in the tunnel.

The nerve is carefully inspected to be sure it is free along its length in the tunnel and not obstructed. The wound is then closed.