Procedure
Endoscopic carpal tunnel release
Minimally invasive release of the transverse carpal ligament to decompress the median nerve at the wrist. A small incision at the wrist crease and an endoscope are used to divide the ligament from beneath. Smaller wounds, less pillar pain, and a faster return to grip strength compared with traditional open release.
Indications
When carpal tunnel surgery is the right operation
Carpal tunnel syndrome is compression of the median nerve as it passes under the transverse carpal ligament at the wrist. It causes numbness, tingling, and weakness in the thumb, index, and middle fingers, often worse at night. Mild and intermittent symptoms can settle without surgery. Surgical release is offered when:
- Symptoms persist despite non-operative treatment. Night splinting, activity modification, and a corticosteroid injection are tried first. Surgery is offered when symptoms continue to disrupt sleep or interfere with daily function.
- There is wasting of the thenar muscles. Loss of bulk at the base of the thumb signals more advanced nerve compression and indicates earlier surgery to prevent further loss of motor function.
- Nerve conduction studies show severe compression. Significantly prolonged distal latencies or reduced amplitudes point to advanced nerve injury and lower the threshold for operative release.
- Constant rather than intermittent symptoms. When numbness is constant rather than coming and going, the nerve has progressed beyond simple positional compression and surgical release becomes more important.
- Functional limitation in everyday tasks. Dropping objects, difficulty with fine motor tasks (buttons, jewellery clasps, doing up laces), and persistent night-time wake-ups disrupt quality of life and tip the balance towards surgery.
How it works
The anatomy and what the release does
The carpal tunnel is a fibro-osseous space at the front of the wrist. The floor and walls are formed by the carpal bones, and the roof is formed by the transverse carpal ligament. Nine tendons that flex the fingers and thumb pass through the tunnel, along with the median nerve.
When the contents of the tunnel are crowded, pressure within the tunnel rises and the median nerve becomes compressed. This causes the typical symptoms of carpal tunnel syndrome: numbness and tingling in the thumb, index, and middle fingers, often worse at night when the wrist is held flexed under the head.
The operation divides the transverse carpal ligament. This opens the roof of the tunnel and immediately reduces the pressure on the median nerve. The nerve is not touched directly. Once the pressure is relieved, the nerve recovers over days to months, depending on how long and how severely it was compressed.
The procedure
What happens in the operating theatre
Endoscopic carpal tunnel release is usually performed as a day case under local anaesthetic with light sedation, or under a regional block. The patient lies supine with the arm out on a hand table.
A small transverse incision is made in the wrist crease, proximal to the carpal tunnel. The fascia and antebrachial connective tissue are opened, and a slotted endoscope cannula is introduced under the transverse carpal ligament. The endoscope camera shows the deep undersurface of the ligament.
A small retractable blade on the cannula is used to divide the ligament from beneath, under direct vision, while preserving the overlying palmar fascia and skin. Once the release is complete, the cannula is removed and the small wrist incision is closed with absorbable sutures.
A soft dressing is applied. Most patients are home within an hour or two. The procedure itself takes about fifteen to thirty minutes per side.
Recovery
What recovery looks like
The hand is encouraged to move from the day of surgery. There is no formal sling or splint. Patients are asked to keep the hand elevated for the first day or two to reduce swelling and to avoid heavy gripping for the first week.
The night-time tingling and numbness typically settle within the first few days. Day-time numbness and clumsiness improve over several weeks as the nerve recovers. If the nerve has been compressed for a long time, sensory recovery can take six to twelve months and is not always complete. Significant thenar muscle wasting often does not fully recover.
Most patients return to light office work within a week, are driving comfortably within one to two weeks, and are back to manual work between two and four weeks depending on grip demands.
Pillar pain (tenderness at the base of the palm where the ligament has been divided) is the commonest niggle and can persist for a few weeks. It almost always settles by three months.
Complications and risks
What can go wrong
Carpal tunnel release is one of the most successful operations in hand surgery. The specific risks include (but are not limited to):
- Incomplete release. Failure to fully divide the transverse carpal ligament leaves ongoing compression and persistent symptoms. Uncommon with careful technique and direct endoscopic visualisation.
- Nerve injury. Direct injury to the median nerve, the recurrent motor branch, or the ulnar nerve is rare. The endoscopic technique requires the surgeon to be familiar with the anatomy seen from beneath the ligament.
- Pillar pain. A common but transient discomfort at the base of the palm that almost always settles within three months.
- Persistent symptoms. If the nerve has been compressed severely or for a long time, sensory recovery can be incomplete. Wasted thenar muscles do not always recover fully. The decompression stops the nerve from being injured further but cannot reverse all of the damage already done.
- Tendon injury. Rare. The flexor tendons sit close to the working area and are protected by the cannula technique.
- Infection. Very uncommon. Antibiotics may or may not be given depending on patient factors.
- Complex regional pain syndrome. Uncommon. A persistent pain syndrome in the hand and forearm that occasionally follows hand surgery and requires multimodal management.
- Recurrence. Very uncommon after a complete release. If recurrent symptoms develop years later, alternative diagnoses are considered first.
FAQ
Frequently asked questions
- When is surgery indicated for carpal tunnel syndrome?
- Surgery is offered when symptoms persist despite non-operative treatment, when there is muscle wasting at the base of the thumb, or when nerve conduction studies show severe compression. Initial management is wrist splinting (particularly at night), activity modification, and a corticosteroid injection. Surgery is the next step when symptoms do not settle, or earlier if there are signs of significant or progressive nerve compression.
- What is the difference between open and endoscopic release?
- Both operations achieve the same goal: dividing the transverse carpal ligament to decompress the median nerve. The open technique uses a longer palmar incision. The endoscopic technique uses a small incision at the wrist crease and a camera to divide the ligament from beneath. The endoscopic approach offers smaller incisions, less pillar pain, and an earlier return to grip strength. Long-term symptom relief is similar between the two techniques.
- How quickly do symptoms improve?
- The night-time tingling and numbness usually settle within the first few days. Day-time numbness and clumsiness improve over several weeks. If the nerve has been severely compressed for a long time, full sensory recovery can take six to twelve months and may not be complete. Wasting of the thumb muscles often does not fully recover even after a successful release.
- How soon can I drive and return to work?
- Light use of the hand begins within a few days. Most patients return to office work within a week, are driving comfortably within one to two weeks, and back to manual work between two and four weeks depending on grip demands. Pillar pain (tenderness at the base of the palm where the ligament was divided) can persist for a few weeks and gradually settles.
- Is the surgery done under general or local anaesthetic?
- Endoscopic carpal tunnel release is usually done as a day case under local anaesthetic with light sedation, or under a regional block. General anaesthesia is occasionally used. The choice depends on patient preference, anaesthetic considerations, and the surgical setup. The procedure itself takes about fifteen to thirty minutes.
Related on this site
Related procedures
Numbness or tingling in the hand?
Book an appointment with Dr Piper
Consultations at Lakeview Private Hospital, Norwest. Bring a referral and any nerve conduction studies you have.