All surgeries cut the transverse carpal ligament (roof of the 'carpal tunnel') and make room to take pressure off the median nerve.
Surgery done with local, sedation or general anesthesia
. Incisions usually from .75 to 4 cm performed open or with a cutting tome or endoscopically. Risks are higher with endoscopy
but recovery faster. See http://carpaltunnelsyndromesurgery.Blogspot.Com/.