Chow technique. A, Incision for entry portal. B, Incision for exit portal. C, Following proximal portal dissection and placement of slotted cannula, transverse fibers of transverse carpal ligament are identified in its entirety, by camera placement in slotted cannula. D, First cut is made with probe knife, cutting distal to proximal, to release distal edge of carpal ligament. E, Second cut made with triangle knife, with cut made in midsection of transverse carpal ligament. F, Third cut made by placing retrograde knife in second cut and drawing it distally to join first cut. G, Proximal section of carpal ligament is identified, and proximal edge is released; probe knife is used to make fourth cut. H, Final cut is made by reinserting retrograde knife into midsection and drawing it proximally to complete release of carpal ligament. SEE TECHNIQUE 77.4.