Carpal Tunnel Release

What the carpal tunnel is

Your wrist has a narrow passage running through it. The floor and walls are the small bones of the wrist. The roof is a stiff band of tissue stretched across them, called the transverse carpal ligament. Through that tunnel run nine tendons that bend your fingers, and one nerve — the median nerve.

It is a crowded space with a hard roof and no room to expand. When the contents swell or the tunnel narrows, something has to take the pressure — and the nerve is the softest thing in there. That is carpal tunnel syndrome.

How you know it is carpal tunnel

• Numbness and tingling in the thumb, index, middle, and half the ring finger. The median nerve feeds those and nothing else.
• Your little finger is spared. That is the single most useful clue — it points at the wrist rather than the neck.
• It wakes you at night. Almost everyone describes this. You wake with a dead hand and shake it out at the edge of the bed.
• It comes on while driving, holding a phone, or reading — anything holding the wrist bent.
• You drop things, or fumble buttons and coins.
• Late on, the muscle at the base of the thumb thins out. That is a sign the nerve has been squeezed a long time, and a reason not to keep waiting.

Diagnosis is mostly the story and the examination. A nerve test — a nerve conduction study, often with an EMG — measures how well the signal is getting through, confirms the problem is at the wrist, and tells us how severe it is. I do not always need one, but it is useful when the picture is muddy or the neck could be involved.

What to try before surgery

• Night splints. A simple wrist splint that keeps your wrist straight while you sleep. This alone fixes a real share of mild cases, because most of the damage happens overnight with the wrist curled.
• Changing what aggravates it — tool grips, keyboard and wrist position, vibration exposure.
• A steroid injection into the tunnel. Often gives months of relief. It is also useful information: a hand that responds well to an injection is a hand that tends to do well with surgery.

I move toward surgery when the numbness is constant rather than occasional, when the nerve test shows real compression, when the thumb muscle is thinning, or when the non-surgical measures have been given a fair try and it keeps coming back.

What the operation does

One thing, and one thing only: it cuts the stiff band forming the roof of the tunnel. The tunnel opens, the pressure comes off the nerve, and the two cut ends heal apart in a longer, looser position — a bigger tunnel, permanently.

Nothing is removed and nothing is implanted. People worry that cutting a ligament weakens the hand; grip strength typically dips for a few weeks and then returns.

Two ways to do it

Both do the same thing to the same ligament. They differ in how we get there.

The traditional (open) release

An incision in the palm, the ligament divided under direct vision, and the skin closed. It has decades of track record and it is the right choice when the anatomy is unusual, when there is scarring from previous surgery, or when something else needs doing at the same time.

This version is done under a general anesthetic — you are asleep, and the usual fasting rules apply beforehand. The incision is larger than the ultrasound-guided version and the recovery is longer.

The ultrasound-guided minimally invasive release

This is the newer approach, and for most straightforward cases it is the one I prefer. Using ultrasound to see the nerve, the tendons, and the ligament in real time, the release is done through a much smaller incision — a few millimetres, rather than opening the palm — so far less of the tissue around the tunnel is disturbed.

The practical differences are what patients care about:

• Numbing medicine only for most people. No general anesthetic.
• Eat a normal breakfast. If you are having it under local anesthesia, there is no fasting. That single fact changes the whole day.
• Back to light duties in about two days, and many people are back to heavy activity in about four — though it can take up to four weeks.
• No narcotics needed. Tylenol and an anti-inflammatory handle it.

You still need a driver, even for the local-anesthesia version. And we do have a short class that walks through exactly how your day will go — linked in the sidebar.

Recovery

• First 24 hoursKeep the hand up above the level of your heart as much as you can. Elevation does more for swelling and pain than anything else. If the dressing feels too tight, you may unwrap and re-wrap it more comfortably after an hour or two.
• 48 hoursDressing off, shower — but leave any Steri-Strips, stitches, or glue alone. Water can run over it; do not soak it in a bath, pool, lake, or hot tub for about three weeks.
• First 2 weeksMove and stretch your fingers as much as you comfortably can. Once the incision has started to heal, massage it. Formal therapy is not usually needed. Keep a Band-Aid on until it stops draining, about a week.
• Return to workAfter the ultrasound-guided release, most people manage light duties in about two days. After the open release, about one to two weeks for light-duty work and four to six weeks for manual labor.
• Follow-upTwo weeks after an open release. After the ultrasound-guided version, most people do not need a visit at all — make one at four weeks if you would like.

What relief actually looks like

This surprises people, so it is worth saying plainly:

• The night waking usually stops almost immediately — often the very first night. That is the most satisfying part of this operation.
• Numbness that comes and goes usually settles over days to weeks.
• Numbness that has been constant for a long time improves more slowly and may not fully recover. A nerve squeezed for years is a nerve with some permanent injury. That is not a reason to skip the operation — it stops things getting worse — but I want you to have the honest expectation going in.
• Tenderness in the heel of the palm when you push on it is normal for a few months. It fades.
• Numbness for a few hours after the procedure is just the numbing medicine. If numbness is not improving after a few days, call and we will take a look.

The risks, honestly

• Incomplete relief The most common disappointment, and it is usually about how long the nerve was compressed beforehand rather than the surgery itself.
• Palm tenderness Soreness in the heel of the hand for weeks to a few months. Common, temporary, and less so with the ultrasound-guided approach.
• Temporary grip weakness Normal for several weeks while things settle.
• Nerve or blood vessel injury Rare. Seeing the structures on ultrasound in real time is one of the reasons I like that approach.
• Infection Rare, and usually superficial when it happens.
• Recurrence Uncommon. When symptoms come back years later it is worth rechecking whether the nerve is being pinched somewhere else, like the neck.