Overview
The carpal tunnel is a passage at the base of the palm, floored by the wrist bones and roofed by a thick band called the transverse carpal ligament. Nine tendons and the median nerve share it, and when the tunnel becomes too tight the nerve is compressed: numbness in the thumb, index and middle fingers, hands that wake you at night, and eventually thumb weakness. Carpal tunnel release divides the ligament so the roof of the tunnel opens and the pressure on the nerve drops immediately.
It is one of the most reliable operations in orthopaedics. Night waking usually stops within days, numbness improves over weeks to months depending on how long the nerve was compressed, and the ligament heals lengthened so the tunnel stays open. The procedure takes about 15 minutes and is done as an outpatient at Bayside Surgery Center in Coconut Grove.
Who It's For
Release is recommended for carpal tunnel syndrome that persists after six to twelve weeks of a night wrist splint, activity changes and, in most patients, an ultrasound-guided steroid injection into the tunnel. Dr. O'Donnell recommends it sooner when there is constant numbness rather than intermittent tingling, weakness or wasting of the thumb muscles at the base of the palm, or a nerve conduction study showing moderate or severe slowing at the wrist. Those findings mean the nerve is being damaged, and the longer that continues the less function returns after release.
Intermittent tingling with a normal exam and a mild nerve study is treated with splinting first, and a good response to a steroid injection both confirms the diagnosis and delays the need for surgery; pregnancy-related carpal tunnel usually resolves after delivery and is splinted. Numbness in the ring and little fingers is a different nerve, treated by cubital tunnel release, and neck-related symptoms are sorted out by exam and nerve study before any hand surgery.
A nerve conduction study showing slowing at the wrist is not by itself a reason for release. Dr. O'Donnell recommends surgery when the distribution of the numbness, the Tinel and Phalen tests and the nerve study all point to the median nerve at the carpal tunnel, and, unless the compression is severe, splinting and an injection have been tried. The carpal tunnel page explains the assessment.
What the Procedure Involves
Most releases are done under local anesthetic with the patient awake, using lidocaine with epinephrine so no tourniquet is needed; light sedation is available for those who prefer it. Open release uses an incision of about 2 cm in the palm, in line with the ring finger. The transverse carpal ligament is divided under direct vision along its full length, and the median nerve is inspected to confirm it is free from forearm to palm.
Endoscopic release divides the same ligament from underneath, through a 1 cm incision at the wrist crease, using a camera and blade in a single instrument. The palm skin is not cut, so pillar pain and the return to gripping are typically a week or two quicker. The open approach gives a fuller view of the nerve and is preferred for revision surgery, unusual anatomy, or when there is something else in the tunnel to address. Results at three months are the same for either technique, and Dr. O'Donnell chooses with you based on your work and the exam.
A few sutures and a soft dressing, and you go home within the hour with the fingers free to move.
Risks & How They Are Minimized
Pillar pain, an ache at the base of the palm on either side of the incision when gripping or leaning on the hand, is the most common complaint after release. It is part of the ligament healing rather than a complication, settles over weeks to a few months, and is milder after endoscopic release. Infection is uncommon; the dressing stays dry for 48 hours.
Injury to the median nerve or its branch to the thumb muscles is rare and is avoided by dividing the ligament along its ulnar side, away from the nerve, under direct vision. Incomplete release, leaving a band of ligament intact, is the usual cause of persistent symptoms and is avoided by confirming the full length of the ligament has been divided before closing. Symptoms that do not improve usually mean the nerve was compressed for too long, or the diagnosis was something else, which is why a nerve study is obtained before surgery when the diagnosis is unclear. Recurrence years later is uncommon.
Recovery & Rehabilitation
The protocol is about keeping the tendons and nerve gliding while the incision heals, so the nerve does not scar to its surroundings. Finger motion starts the day of surgery, and most patients need only a home program.
| Phase | Timing | What happens |
|---|---|---|
| Early motion | Weeks 0–2 | Soft dressing. Active finger, thumb and wrist range of motion; tendon and median-nerve gliding exercises; elevation for swelling. No heavy grip or pinch. |
| Motion & scar care | Weeks 2–6 | Full wrist and finger motion; scar mobilization and desensitization; continued glides; light grip and pinch strengthening begins. |
| Strengthening | Weeks 6–12 | Progressive grip and pinch strengthening with putty and grippers, forearm strengthening, and work-conditioning for manual jobs. Return to normal activity, though pillar pain may linger. |
Desk work is possible within a few days; driving once you are off any narcotic medication and can grip the wheel, usually within a week. Heavy gripping, forceful pinching and repetitive wrist loading are avoided for four to six weeks, so manual workers are typically back to full duty at six to eight weeks.
Protocol summary
The precautions are a soft dressing with the incision kept clean and dry, elevation to control swelling, and no heavy gripping, forceful pinching or repetitive wrist loading for about four to six weeks. Active finger and wrist motion with tendon and median-nerve gliding starts immediately.
Phases advance on criteria: wound healing and full active finger motion to leave Phase I, full motion with improving scar mobility to leave Phase II, and grip and pinch strength improving toward symmetric to finish, with the note that pillar pain may linger beyond that point. Formal hand therapy is added for a stiff or hypersensitive scar or a slow return of grip strength.
Physical Therapy Protocol
Carpal Tunnel Release PDF ↗Frequently Asked Questions
Is carpal tunnel surgery worth it?
For constant numbness, thumb weakness or a nerve study showing moderate or severe compression, usually yes, when the exam and the nerve study point to the same nerve at the same site: those findings do not reverse with splints, and release stops further damage to the nerve. For intermittent tingling with a normal exam, a night splint and an injection are tried first, and many patients never need surgery.
Open or endoscopic carpal tunnel release, which is better?
Both divide the same ligament and give the same result at three months. Endoscopic release avoids an incision in the palm, so pillar pain is milder and gripping returns a week or two sooner. Open release gives a fuller view of the nerve and is preferred for revisions or unusual anatomy. Dr. O'Donnell discusses which suits your work.
Will I be awake during carpal tunnel surgery?
Usually, yes. Most releases are done under local anesthetic alone, using lidocaine with epinephrine so no tourniquet is needed; you feel pressure but no pain, and there is no anesthetic to recover from afterward. Light sedation is available if you would rather not be aware of the procedure. The operation takes about 15 minutes and you go home within the hour.
How long after carpal tunnel release can I use my hand?
Fingers move the same day and light use, typing and eating are fine within a few days. Driving is usually possible within a week once you are off any narcotic medication. Heavy gripping and repetitive wrist loading wait four to six weeks, and manual workers return to full duty around six to eight weeks per the protocol.
How long does numbness last after carpal tunnel surgery?
Night symptoms and tingling often improve within days. Constant numbness takes longer, because the nerve has to recover from the compression, and improvement can continue for six to twelve months. Patients with long-standing severe compression and thumb wasting may keep some numbness permanently, which is why surgery is recommended before that stage.
This page is for general education and is not a substitute for a medical evaluation. The right procedure depends on your individual diagnosis, anatomy, and goals. Kevin O'Donnell, MD sees patients from Coral Gables, Miami, Brickell, Pinecrest and Coconut Grove at 475 Biltmore Way, and out-of-town patients by telemedicine.