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Carpal Tunnel Syndrome
Updated: Oct 4 2016

Primary Endoscopic Carpal Tunnel Release

Preoperative Patient Care
Operative Techniques

Preoperative Plan


Execute surgical walkthrough

  • describe the steps verbally to the attending prior to the start of the case
  • describe potential complications and steps to avoid them

Room Preparation


Surgical instrumentation

  • Loupes recommended


Room setup and equipment

  • standard operative table and hand table


Patient positioning

  • supine position

Transverse Incision


Identify anatomic landmarks

  • draw out the palmaris longus, flexor carpi radialis and the flexor carpi ulnaris


Make incision

  • make a 1 to 2 cm transverse incision in the wrist flexion crease centered over or just ulnar to the palmaris longus
  • if the palmaris longus is not present make the incision half way between the FCR and the FCU

Deep Dissection


Expose the palmaris longus and retract it radially with a Ragnell retractor


Identify and divide the flexor retinaculum

  • create a U shaped flap that is 1 cm wide


Retract the flap

  • use a mosquito clamp to retract the flap

Prepare Carpal Tunnel


Place Hamate finders

  • pass small and large hamate finders down the carpal tunnel to evaluate the space and location of the hamate


Ensure proper location of instruments

  • palpate the instruments distal to the TCL at the Kaplan cardinal line
  • if the instruments are palpable proximally then the instruments are not properly placed
  • this could indicate that the insruments are in Guyons canal


Separate synovium from the TCL

  • pass the tenosynovial elevator proximally and distally a dozen times along the axis of the fourth ray to dissect the synovium from the undersurface of the TCL

Device Insertion


Insert the assembled endoscopic device into the carpal tunnel

  • direct the endoscope palmarly.


Visual the the undersurface of the TCL

  • TCL has transverse striations


Advance the instrument until the distal edge of the TCL is identified

  • the distal edge is identified by a white transverse fiber of the TCL with a yellow amorphous midpalmar fat
  • this fat can contain vessels and nerves

Identify Anatomy with Scope


Perform a ballotment maneuver with the non dominant hand

  • this is done to distinguish the transition between the midpalmar fat and the distal edge of the TCL


Palpate the distal edge of the scope as it emerges into the into the subcutaneous space just distal to the TCL

  • place device in the dominant hand
  • look for a change in the transillumination pattern as the device is moved from underneath the TCL to the transpalmar fat

TCL release


Divide the TCL

  • elevate the blade of the device while withdrawing device slowly
  • this cuts the TCL from distally to proximally
  • keep the device pressed against the undersurface of the TCL so that no structures come between the TCL and the blade to ensure no other structures are cut
  • only cut the TCL when visualization is excellent
  • repeat this step until the TCL is completely released
  • make sure that there is release from the radial and ulnar flaps from a proximal to distal direction
  • this is ensured by pressing the device against the palmar tissue and being able to seen only one flap at a time
  • also place the device in the trough between the radial and ulnar leaflets
  • visualization of the leaflets should not be possible with the device in this position


Divide the antebrachial fascia

  • withdraw the endoscopic device and place hamate finders
  • divide the antebrachial fascia with long tenotomy scissors under direct visualization

Wound Closure


Irrigation, hemostasis, and drain

  • ensure hemostasis



  • use 3-0 nylon to close skin


Dressing and immediate immobilization

  • place in a soft dressing
Postoperative Patient Care
Private Note

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