What are the steps of a standard carpal tunnel release surgery?

Carpal Tunnel Release Surgical Technique

Both open and endoscopic carpal tunnel release techniques are equally effective for symptom relief and functional improvement, though the choice depends on surgeon expertise and patient-specific anatomical considerations. 1

Standard Open Carpal Tunnel Release Steps

The traditional open technique remains the gold standard and involves the following algorithmic approach:

Incision and Exposure

• Make a longitudinal incision in the palm, typically starting at the distal wrist crease and extending distally toward the ring finger, staying ulnar to the thenar crease to avoid the palmar cutaneous branch of the median nerve 2, 3
• Incise through skin and subcutaneous tissue, identifying and protecting the palmar cutaneous branch
• Expose the transverse carpal ligament (flexor retinaculum)

Ligament Division

• Completely divide the transverse carpal ligament under direct visualization from proximal to distal 2, 3
• Ensure complete release by palpating for any remaining fibers
• Visualize the median nerve to confirm adequate decompression and assess for any anatomical variants or space-occupying lesions

Closure

• Irrigate the wound
• Close skin only (subcutaneous closure optional)
• Apply soft dressing allowing early finger motion

Endoscopic Technique Considerations

Endoscopic release offers faster return to work and improved grip strength recovery compared to open release, but carries a slightly higher risk of nerve injury. 1

Single-Portal Approach

• Insert endoscope through a single proximal incision at the wrist 4, 5
• Visualize the transverse carpal ligament endoscopically
• Divide the ligament using specialized cutting instruments under direct visualization
• Confirm complete release by visualizing the median nerve and surrounding structures

Dual-Portal Approach

• Create both proximal (wrist) and distal (palm) portals 2
• Pass endoscope through to visualize the ligament from both perspectives
• Provides enhanced visualization but requires two incisions

Emerging Ultrasound-Guided Technique

Ultrasound-guided carpal tunnel release is emerging as a minimally invasive alternative with comparable outcomes, reduced soft tissue trauma, and faster recovery. 6, 7

Key Steps

• Perform real-time ultrasound imaging to identify the median nerve, transverse carpal ligament, and surrounding structures 6, 7
• Use ultrasound guidance to precisely place a specialized cutting device or thread-based instrument 2
• Divide the ligament under continuous ultrasound visualization, protecting the median nerve throughout
• Requires only a small percutaneous entry point, typically 2-3mm 7

Critical Anatomical Structures at Risk

Protect these structures during any technique:

• Median nerve and its branches (especially the recurrent motor branch to thenar muscles) 3
• Palmar cutaneous branch (exits proximal to the carpal tunnel, typically 5-6cm proximal to wrist crease) 3
• Superficial palmar arch (lies distal to the transverse carpal ligament)
• Ulnar neurovascular bundle in Guyon's canal (lies ulnar to the carpal tunnel) 8

Common Pitfalls to Avoid

• Incomplete ligament release: The most common cause of persistent symptoms post-operatively 8, 9. Ensure complete division from proximal to distal extent
• Injury to recurrent motor branch: Anatomical variants occur in up to 23% of patients; always identify nerve anatomy before complete ligament division 2
• Inadequate proximal release: Extend release proximally into the antebrachial fascia if needed for complete decompression 8
• Failure to identify space-occupying lesions: Directly visualize the median nerve to identify masses, persistent median artery, or bifid nerve variants 10, 7

Technique Selection Algorithm

Choose open release when:

• Surgeon has limited endoscopic experience
• Anatomical variants suspected on preoperative imaging
• Revision surgery required 8, 9
• Mass lesion or space-occupying pathology present

Choose endoscopic release when:

• Surgeon is experienced with the technique
• Patient prioritizes faster return to work and grip strength recovery 1
• Standard anatomy confirmed
• Patient accepts slightly higher nerve injury risk

Choose ultrasound-guided release when:

• Surgeon has advanced ultrasound skills
• Patient desires minimal incision and fastest recovery 6, 7
• Real-time nerve visualization is prioritized
• Technique is available and surgeon is trained 2