Carpal tunnel surgery without an incision

What “without an incision” actually means

The phrase gets used loosely, so here is the honest distinction between the three options.

Open surgery needs a cut in the palm, usually three to five centimetres. Skin, subcutaneous tissue and the palmar fascia are divided to reach the ligament under direct view. It is the oldest and best-studied technique – and the one with the longest recovery.

Endoscopic surgery uses roughly five millimetres. A camera goes in through that small port and the ligament is divided under camera view. The palm itself stays intact, which is why the pain afterwards is markedly lower. More on the endoscopic technique.

Ultrasound-guided release goes one step further: no cut at all. The skin is punctured with a cannula, the way it is for a blood draw, and an instrument about 1.5 millimetres across is introduced through it. There is no wound to close, so there are no stitches and no suture removal.

How the procedure runs

1. Preparation. You sit or lie with your arm supported. No tourniquet is applied to the upper arm – the part many patients describe as the most unpleasant element of hand surgery.

2. Local anaesthetic under ultrasound control. The anaesthetic is placed exactly where it is needed, superficially and beneath the ligament, with the ultrasound showing where the fluid goes. You stay awake and can talk throughout.

3. The puncture. The instrument is introduced through a cannula. This is the moment where other techniques would use a scalpel.

4. The division. The ligament is divided on the little-finger side, at a safe distance from the median nerve, while the ultrasound shows in real time where the instrument is, where the nerve lies and how far the division has progressed.

5. Confirmation. The completeness of the division is checked on ultrasound before we finish. That matters: an incomplete release is one of the commonest reasons symptoms persist after carpal tunnel surgery.

6. Afterwards. A plaster. No bandage for weeks, no sutures. In the published study the whole procedure averaged ten and a half minutes.

Why ultrasound rather than a camera

Modern high-resolution ultrasound resolves structures at the wrist down to fractions of a millimetre: the median nerve, the tendons, the vessels, the ligament itself. And it shows them moving, in real time – not as a still image the way an X-ray or MRI does.

For a procedure where a few millimetres of clearance from the nerve decide everything, that is the advantage that counts. No radiation, no contrast agent, and a view that updates as the instrument moves.

What the evidence shows

A meta-analysis of randomised trials covering 221 patients found, for ultrasound-guided release compared with open surgery: a return to normal activities about 21 days earlier, better functional scores at three months, and no difference in complications (14 complications among 221 patients, 6.3 %).

A multicentre trial across seven centres (149 patients, 226 hands) using an ultrasound-guided blade device reported a return to normal activities after a median of two days and to work after four, with 94 % satisfied at six months and no conversion to open surgery.

For the incision-free puncture technique we use, a prospective study is available: division succeeded in every hand, no adverse events occurred, and after two months all patients had resumed their usual activities.

The honest placement of that: this is the youngest of these techniques and therefore has the newest evidence base. Endoscopic release has been studied for decades in large series. What the studies show so far is that the technique works and is safe; long-term series over many years are still to come.

What it means for your recovery

Because neither skin nor palmar fascia is divided, the wound that normally dominates the first days simply is not there. In practice: no suture removal, no weeks of wound care, showering usually possible early, and the hand may be used straight away within the limits of comfort.

What remains is the same for every technique. The divided ends of the ligament need to settle, and the nerve needs time. A common misunderstanding is that the incision-free technique also speeds up nerve recovery – it does not. How quickly numbness resolves depends on how severe and how long-standing the compression was, not on the size of the access.

When I advise against it

Where the anatomy cannot be identified beyond doubt on ultrasound. Where the same wrist has been operated on before and scar tissue has changed the relationships. And where something inside the tunnel needs treating that goes beyond dividing the ligament – a ganglion, a markedly thickened tendon sheath.

In those situations another technique is not the worse choice, it is the right one. Saying so is part of the job.