Carpal tunnel release can be performed as an open operation, as a smaller-incision endoscopic procedure, or using ultrasound guidance. All three achieve the same result: dividing the ligament that is pressing on the median nerve. They differ in wound size, how quickly the hand can be used afterward, and which patients benefit most from each. This article sets out how that choice is actually made.
The majority of carpal tunnel operations performed in the UK are open procedures. This is not because open surgery gives a better result. It is largely because open surgery costs less to provide, and endoscopic release has not historically been available through the NHS. Where cost is not the deciding factor, most patients who understand the alternatives choose one of the smaller-incision options. The Cheshire Hand Clinic offers all three techniques, so the choice can be made on clinical grounds rather than availability.
Endoscopic release is carried out through a small incision across the wrist, under 1cm long. A padded bandage is worn for the first 24 hours. After that, a small dressing covers the wound, and the hand is largely free to use for everyday tasks such as washing or personal hygiene, considerably sooner than after open surgery.
For most patients, this difference is one of comfort. For two specific groups, it is more than that.
The first group is patients who rely on their hands for mobility. This includes wheelchair users who self-propel, and anyone who uses a walking frame, crutches, or a walking stick that requires pressing down through the hand. After an open release, these patients may be unable to safely bear weight through the hand for several weeks. This can leave them effectively housebound. Endoscopic release avoids this problem, since the hand can take weight again much sooner.
The second group is patients considering having both hands treated at the same time, for example those who can only take a short period off work or away from running a business. Endoscopic release only requires 24 hours of padded bandaging, so both hands can realistically be operated on together and be usable again within a similar timeframe. Doing both hands as open procedures at once tends to leave a patient dependent on a partner or carer for basic personal care during early recovery.
The published evidence is consistent with this pattern. Reviews pooling multiple studies have found that patients return to work roughly six to eight days sooner after endoscopic release compared with open release, and show better early grip and pinch strength in the first three months. Endoscopic release is also associated with a lower rate of injury to nearby structures such as arteries or tendons, though it carries a slightly higher rate of brief, temporary nerve irritation. Open release is associated with more wound-related problems overall.
Some degree of pillar pain, discomfort along the sides of the palm during healing, occurs with every technique. It comes from the ligament itself being divided, not from the size of the skin incision. What does differ is scar sensitivity, which tends to be milder after endoscopic release than after open release. Overall recovery speed is also genuinely faster with endoscopic or ultrasound-guided release, as set out above. A fuller explanation of pillar pain, and what recovery generally looks like week to week, is covered in the main article on carpal tunnel syndrome.
Comparing endoscopic release with ultrasound-guided release is a closer decision than comparing either with open surgery. Clinically, there is little to separate the two. The choice often comes down to a mixture of anatomy, the surgeon's own experience, and a handful of practical differences.
One consideration is direct visualisation of the nerve. Endoscopic release allows the surgeon to see the nerve through a small camera during the procedure, which is a preference some surgeons place a high value on. Ultrasound-guided release instead relies on the ultrasound image to guide the instrument, and typically takes a surgeon longer to become confident with than endoscopic release does. Both are considered safe, effective techniques where the surgeon performing them has appropriate experience.
"The smaller the incision, the better the result."
All three techniques divide the same ligament and relieve the same pressure on the nerve. A smaller incision means less early discomfort and a shorter period of restricted hand use, not a different or superior operation underneath.
"Endoscopic release is not offered on the NHS because it does not work as well."
Cost, not clinical outcome, is the reason. Endoscopic release has not historically been funded through the NHS, largely on cost grounds, not because it produces a worse result.
"Pillar pain after surgery means the operation has not worked."
Pillar pain is expected with every technique, because it comes from the ligament healing, not from a problem with the procedure. It settles over about three months as the ligament heals, regardless of which technique was used.
Is endoscopic or ultrasound-guided release always possible?
No. Where the carpal tunnel anatomy is scarred, unusually narrow, or difficult to visualise clearly, an open approach may be the only safe option. This is one of the things assessed during the ultrasound scan taken as part of the consultation. Revision surgery, a repeat release in a patient who has already had carpal tunnel surgery before, is another example. This applies regardless of how long ago the original operation was, whether that was six weeks earlier or several years earlier: any revision procedure is generally performed as an open operation rather than through endoscopic or ultrasound-guided release.
Does a smaller incision mean a faster overall recovery?
Generally, yes. Hand use in the first days after surgery returns faster with endoscopic or ultrasound-guided release, and published data also shows earlier return to work and faster early grip strength recovery compared with open release. This is, in practice, the main reason many patients choose one of these techniques over an open procedure.
Can both hands be treated in one sitting?
This is more practical with endoscopic release, given the shorter period of restricted hand use, though it remains a decision made on an individual basis with the surgeon.
Reference:
The Cheshire Hand Clinic offers open, endoscopic, and ultrasound-guided carpal tunnel release, allowing the technique to be selected on clinical grounds specific to each patient.
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