Carpal tunnel syndrome, its cause and its symptoms, are described on a dedicated page. This page focuses on one specific point: how this syndrome is operated on through the micro-invasive endoscopic or ultrasound-guided approach, what this approach offers, who it suits, and where its limits lie. It applies, to the most common procedure, the principles set out on the page devoted to endoscopic or ultrasound-guided surgery.
What the operation corrects
In the carpal tunnel, the median nerve runs through a narrow tunnel in the wrist, beneath a thick ligament — the transverse carpal ligament. When pressure rises inside this tunnel, the nerve is compressed, which causes the characteristic tingling, pain and loss of strength. The principle of all carpal tunnel surgery is simple and constant, whatever the technique: cutting this ligament to open the tunnel and make room for the nerve. What changes from one method to another is not the action on the ligament but the way it is reached.
The three possible approaches — and where ultrasound guidance fits in
There are three main ways to cut the ligament, from the oldest to the most recent:
Open surgery
An incision in the palm exposes the ligament, which is cut under direct view. It is the reference technique, proven and reliable, but with a larger scar and sometimes discomfort when leaning on the palm for a few weeks.
Endoscopic surgery
A miniature camera, inserted through a small incision, allows the ligament to be cut under video control. It is a minimally invasive technique by definition.
Ultrasound-guided surgery
The instrument is guided by the ultrasound image, through a few-millimeter incision. A more recent minimally invasive technique, which will need enough follow-up in the years ahead to confirm its formal reliability on a large scale.
None of these techniques is "the best" in absolute terms. They all cut the same ligament and relieve the nerve; they differ in the size of the approach, the recovery, the equipment and the situations they suit. The right choice depends on the patient, their anatomy and the surgeon's informed preference. Open surgery remains a solid reference, and ultrasound guidance an appealing minimally invasive option in selected cases.
How a minimally invasive release unfolds
In concrete terms, how does the procedure go? The typical course, for a patient who is a good candidate:
Local anesthesia alone, without going under general anesthesia, or a low nerve block: the wrist area is numbed.
Endoscopic technique
Two micro-incisions are made and a camera is inserted along with a guard protecting the vital anatomical structures. The ligament is cut under camera control on a 4K video screen, with optical magnification. The minimal skin entry point is closed. Simple dressing. No immobilization. Immediate self-directed rehabilitation with no restriction of movement.
Ultrasound surgery
Ultrasound mapping: the surgeon views the median nerve, the ligament and the vessels, and identifies any anatomical variations before doing anything.
Micro-incision and guided cut: through a few-millimeter entry point, the instrument is brought to the ligament under image control, and the ligament is cut while the surgeon follows the action on the screen, in real time.
End of the procedure: the entry point is so small that it often needs no stitch. A simple dressing is enough.
The procedure is short, and the patient goes home the same day. This is why the post-operative course usually reported is so mild.
The reported benefits — without overselling them
Publications on endoscopic or ultrasound-guided release describe a favorable recovery, which should be presented honestly, as trends rather than guarantees:
A quick return to activities and work, often within one to two weeks in the published series.
A low complication rate in the reported series, with imaging helping to avoid at-risk structures.
Simple local anesthesia, on an outpatient basis, sometimes outside a conventional operating room.
These results are encouraging, but they come mainly from series by experienced teams, and this is especially true for the ultrasound techniques: they reflect the potential of the technique in trained hands, not a universal guarantee.
What to know before choosing the minimally invasive ultrasound technique over the minimally invasive endoscopic technique
A recent and demanding technique
It requires a dual skill set — ultrasound and surgery — and a learning curve: its reliability depends on the operator's experience.
Not every situation is suited to it
Certain anatomies, a severe or long-standing compression, or a previous operation may point toward the open approach.
The long-term evidence is still being built
Studies directly comparing ultrasound guidance with the open and endoscopic approaches over the long term are ongoing; to date, ultrasound guidance is a promising option, not a proven superiority over all the others.
Expertise grounded in teaching the technique
Ultrasound-guided carpal tunnel release falls within the field of ultrasound-guided surgery, whose teaching in France Dr Teboul helped to structure: he created the first dedicated inter-university diploma.
Summary points
These points sum up the procedure: the same goal as conventional surgery — releasing the nerve — reached through a minimally invasive approach, in carefully selected cases.
Frequently asked questions
Glossary
Fibrous band that closes the carpal tunnel; cutting it decompresses the median nerve.
The nerve compressed in the carpal tunnel, responsible for the tingling and loss of strength.
Cutting of the ligament guided by real-time ultrasound imaging.
Cutting of the ligament under the control of a miniature camera, through a small incision.
Care in which the patient goes home the same day as the procedure.
References
Sources supporting the facts presented. Dr Teboul's contribution to teaching ultrasound surgery is shown in bold.
Teboul F — Founder of the first Inter-University Diploma in ultrasound for the upper-limb surgeon; president of GREEMS. Institutional and teaching role in ultrasound-guided surgery.
Carpal Tunnel Release With Ultrasound Guidance: Intermediate-Term Clinical Outcomes and MRI Findings. Journal of Hand Surgery Global Online, 2023 — safe and effective under WALANT; quick return to work, decompression confirmed on MRI (other authors).
Rojo-Manaute JM, et al. Ultra-Minimally Invasive Ultrasound-Guided Carpal Tunnel Release: a Randomized Clinical Trial. Journal of Ultrasound in Medicine, 2016 (other authors).
Ultrasound-guided carpal tunnel release: the retrograde technique (series of 816 procedures, complications ~0.7%). Hand Surgery & Rehabilitation, 2025 — safety profile (other authors).
Page reviewed and approved by Dr Frédéric Teboul, hand, brachial plexus and peripheral nerve surgeon, member of the Académie Nationale de Chirurgie, founder of the first French inter-university diploma in ultrasound-guided surgery and president of GREEMS.
Last updated: August 23, 2026
Disclaimer. This page is intended to provide information about a surgical technique. It does not replace a consultation. The choice of surgical approach is assessed case by case; open surgery remains a reference in many situations.
Author of this publication
Every piece of content is signed by its author and reviewed before publication.
Author
Dr Frédéric Teboul
Hand surgeon · founder of the first French inter-university diploma in ultrasound-guided surgery