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In page Carpal tunnel surgery:

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Briefly, the endoscopic method can be performed using either one portal,[5] or two portals.[6] In the Agee single-portal technique, a small transverse skin incision is made at the ulnar border of the palamaris longus tendon. A distally based flap of forearm fascia is elevated to expose the proximal end of the carpal canal. With the wrist held in slight extension, the endoscopic blade is inserted into the canal, the distal edge of the TCL is identified, and the ligament is sectioned distally to proximally. The two portal technique requires a proximal incision and a distal incision deep to the TCL.[citation needed]