Overview
The median nerve passes through a narrow corridor at the base of your palm called the carpal tunnel. The roof of that corridor is a tough fibrous band, the transverse carpal ligament. When pressure rises inside the tunnel, the nerve gets squeezed. The pressure can come from swelling of the nearby tendons, fluid buildup, or simply a naturally tight tunnel. The classic symptoms are numbness and tingling in the thumb, index, middle, and the thumb-side half of the ring finger. The hallmark of carpal tunnel syndrome is pain and tingling at night that wakes you up. With it comes the urge to shake out the hand for relief.
How the Procedure Works
The release can be done open or with a camera (endoscopic). The choice depends on anatomy and surgeon preference. Both reliably take the pressure off the nerve when done correctly. With an open approach, we make a small incision in the palm. We find the transverse carpal ligament under direct vision and divide it completely, working from the palm end back toward the wrist. Two nerve branches are protected along the way. One gives feeling to the skin of the palm. The other swings back to power the muscles at the base of the thumb. An incomplete release is the most common reason symptoms persist. So before closing, we confirm the entire ligament is divided.
With an endoscopic release, a thin tube is passed through a single small incision at the wrist crease. The ligament is cut from underneath, with a camera showing the way. The result is a smaller scar, often slightly faster grip recovery, and the same pressure relief. Numbness in the fingers typically begins improving early in recovery. Thumb-muscle weakness and wasting recover more slowly, if at all, because nerves regrow gradually.
When to Consider Carpal Tunnel Release
We generally offer carpal tunnel release when symptoms, testing, and a full course of non-surgical care all point to surgery as the next step. The typical picture includes:
Median nerve symptoms
Numbness, tingling, and night symptoms in the parts of the hand the median nerve supplies.
Failed conservative care
A night splint, activity changes, and a steroid (corticosteroid) injection that has not given lasting relief.
Electrodiagnostic confirmation
A nerve conduction study (an electrical test of how nerve signals travel) confirming that the median nerve is squeezed at the wrist.
Treats: Carpal Tunnel Syndrome
Risks & Why We Still Recommend It
Every operation carries risk. This procedure is offered because the condition, when left untreated, can cause the nerve being squeezed harder over time, ending in fixed numbness, wasting of the thumb muscles, and a weak pinch that does not recover even after a late release. The decision to proceed weighs the risks of surgery against the limitations the condition places on daily function. Surgery does not remove risk; it addresses a problem that is otherwise progressive. Whether it is appropriate is determined for each patient in consultation with the surgeon.
The risks we discuss with you before carpal tunnel release include:
- bleeding and infection
- anesthesia risk (most cases use local numbing with light sedation, which changes the risk picture)
- pillar pain, a temporary ache on either side of the palm where the ligament was cut, lasting weeks to a few months
- scar tenderness
- an incomplete release that needs a second surgery
- injury to the median nerve or its thumb-muscle branch (rare)
Surgery makes sense when carpal tunnel syndrome is confirmed by both your exam and nerve testing, and splinting and activity changes have not fixed it. If that picture does not fit you, we do not offer this operation.
Frequently Asked
questions we hear in clinicWill I be asleep for the surgery?
Most cases use local numbing with light sedation rather than full general anesthesia, which changes the risk picture compared with larger operations.
Open or endoscopic, which is better?
Both reliably take the pressure off the nerve when done correctly; the choice depends on anatomy and surgeon preference. The endoscopic route uses a single small incision at the wrist crease and leaves a smaller scar with often slightly faster grip recovery, and the same pressure relief.
How soon will the numbness go away?
Numbness in the fingers typically begins improving early in recovery. Thumb-muscle weakness and wasting recover more slowly, if at all, because nerves regrow gradually. That is one reason we do not recommend waiting until the muscle is already wasting.
Why do symptoms persist for some people after a release?
An incomplete release is the most common reason symptoms persist. Before closing, we confirm the entire ligament is divided.
What is pillar pain?
A temporary ache on either side of the palm where the ligament was cut. It typically lasts weeks to a few months.
Can I just keep wearing the night splint instead?
Surgery is offered when a night splint, activity changes, and a steroid injection have not given lasting relief and nerve testing confirms the diagnosis. Left untreated, the nerve gets squeezed harder over time, and the end result is fixed numbness, wasting of the thumb muscles, and a weak pinch that does not recover even after a late release.
Further Reading
External patient-education references and related OSI pages for additional background:
