What 'Minimally Invasive' Really Means in Hand Surgery

Creator: Dr. Pedro Loredo
Published: 2026-04-27

By Dr. Pedro Loredo, MD · Hand Surgeon Triple board-certified hand surgeon

Medically reviewed by Dr. Pedro Loredo, MD · Last reviewed: 2026-04-27

"Minimally invasive" in hand surgery means using small incisions, less tissue disruption, and specialized instruments (often a small camera) to accomplish the same surgical goal as traditional open surgery, with the benefit of faster recovery, smaller scars, and lower complication rates. The most common minimally invasive hand procedures are endoscopic carpal tunnel release and endoscopic cubital tunnel release. Trigger finger surgery uses an open A1 pulley release with a small 1 to 2 cm palm incision, which gives direct visualization of the A1 pulley and full protection of the digital nerves. The right technique depends on the case. This article explains what the term actually means, what trade-offs exist, and when minimally invasive is NOT appropriate.

The Concept and the Trade-Off

Traditional open hand surgery uses a longer incision (often 3 to 6 cm) that allows direct visualization of the surgical field. The surgeon sees and feels every structure, dissects layer by layer, and operates with the full anatomy in view.

Minimally invasive (or endoscopic) hand surgery uses a much smaller incision (often less than 1 cm) plus a fiber-optic camera or specialized retractor to visualize the structures from a different angle. The surgeon sees the field on a video monitor and uses small instruments through the same incision or a second tiny port.

The benefit of the smaller incision is real: less surrounding tissue disruption, less postoperative pain, smaller scar, faster return to activity, lower rates of pillar pain (a common post-carpal-tunnel complaint that comes from cutting through the palmar fascia in open surgery), and quicker overall recovery.

The trade-off is also real: visualization is more limited. The surgeon sees what the camera or retractor shows. Anatomic variants (an unusual nerve branch, a vessel where one is not expected, scar tissue from prior surgery) are harder to identify and protect. For straightforward cases, this trade-off favors the minimally invasive approach. For complex cases, it does not.

What Dr. Loredo Performs Endoscopically

The procedures we routinely perform with a minimally invasive endoscopic technique:

Endoscopic carpal tunnel release: the gold-standard minimally invasive procedure in hand surgery. A small wrist incision (less than 1 cm), endoscopic visualization of the transverse carpal ligament, and division of the ligament under direct vision. Most patients return to light typing within days and full activity within 2 to 4 weeks.
Endoscopic cubital tunnel release: a small incision behind the medial epicondyle, endoscopic visualization of the cubital tunnel and Osborne's ligament, and decompression of the ulnar nerve. Avoids the larger incision and longer scar of traditional ulnar nerve transposition surgery.

Trigger finger surgery uses an open A1 pulley release with a small 1 to 2 cm palm incision under local anesthesia. The open approach gives direct visualization of the A1 pulley and full protection of the digital nerves and blood vessels. Many trigger finger patients return to typing the same week. See the trigger finger page for the full procedure detail.

Other procedures use a minimally invasive concept without an endoscope. Percutaneous needle aponeurotomy for Dupuytren's contracture, percutaneous screw fixation for scaphoid fractures, and small-incision open trigger finger release all share the philosophy: smaller incision, less tissue disruption, faster recovery.

A short video from Dr. Loredo on endoscopic carpal tunnel release. View on YouTube.

Single-Port Versus Two-Port Endoscopic Technique

For endoscopic carpal tunnel release specifically, two main techniques exist:

Single-port (Agee technique): one small wrist crease incision. The endoscope and the cutting blade are combined into one device that enters through this single port. Cosmetically the cleanest result; often only one tiny scar visible.
Two-port (Chow technique): one small wrist incision and one small palm incision. The endoscope enters through one port and the cutting blade through the other. Slightly more visualization of the ligament from two angles, but two scars instead of one.

Both techniques produce excellent outcomes in experienced hands. The choice often comes down to surgeon training and comfort. What matters more than the port count is the surgeon's experience with the technique. Dr. Loredo trained in both techniques during his fellowship at the Christine M. Kleinert Institute and continues to use whichever approach best fits the individual patient's anatomy.

When Minimally Invasive Is NOT the Right Choice

Several scenarios push the decision toward traditional open surgery:

Revision surgery after prior carpal tunnel release. The first operation creates scar tissue that makes endoscopic visualization unreliable and increases the risk to the median nerve. Revision is almost always done open.
Anatomic variants identified preoperatively. A bifid median nerve, a transligamentous motor branch, or other variants make endoscopic visualization potentially dangerous. Open surgery allows the surgeon to identify and protect the variant directly.
Mass or tumor associated with the nerve compression. Removing the mass safely requires direct exposure.
Severe carpal tunnel with extensive intra-canal pathology (gout tophi, rheumatoid synovitis, or amyloid deposits). The synovectomy needed in these cases is done open.
Combined procedures. Carpal tunnel release plus a CMC arthroplasty, or carpal tunnel plus tendon transfer, are easier and safer through traditional open exposure.
Traumatic injuries with extensive tissue damage. Lacerations, crush injuries, and complex fracture-dislocations need direct exposure to identify and repair all the damaged structures.
Patient anatomy that does not accommodate the endoscope. Very small or very swollen wrists sometimes do not permit safe endoscopic placement, and the surgeon converts to open mid-procedure.

The conversion rate (the percentage of cases that start endoscopically and convert to open) is a useful number to know about a surgeon. A reasonable rate is 1 to 5 percent. A 0 percent rate is not reassuring; it suggests the surgeon may push through situations that warrant conversion. A high rate suggests insufficient case selection. Honest case selection produces a small but non-zero conversion rate.

What to Ask Your Surgeon

If you are considering endoscopic versus open surgery, useful questions:

How often do you perform this procedure?
Are you trained in both endoscopic and open techniques?
What is your conversion rate to open if the endoscopic approach cannot be safely completed?
What does my specific anatomy or condition suggest about which approach is right?
What does the recovery look like for both approaches in your patients?
Are there reasons in my case that would make open surgery a better choice?

A surgeon who can discuss both approaches comfortably and recommend the right one for your specific situation is more useful than a surgeon committed to one technique regardless of the case.

How Training Shapes the Choice

Dr. Loredo completed fellowship training at the Christine M. Kleinert Institute in Louisville, Kentucky, the world-renowned hand and microsurgery program founded by the pioneers of hand microsurgery. The fellowship trained surgeons in the full spectrum of hand surgery: open and endoscopic, primary and revision, simple and complex. That breadth of training is what allows a surgeon to choose the right approach for each case rather than defaulting to one technique. The triple board certification (American Board of Surgery in General Surgery, American Board of Surgery hand subspecialty, and American Board of Plastic Surgery hand subspecialty) reinforces the same point: training across multiple specialties produces better judgment about which technique fits the case.

Frequently Asked Questions

Is minimally invasive surgery always better than open surgery?

No. Minimally invasive technique is the right choice when the anatomy is straightforward, the diagnosis is confident, and the procedure can be performed safely with the limited visualization a small-incision approach provides. For complex revisions, traumatic injuries with extensive tissue damage, anatomic variants that cannot be safely managed with limited exposure, and certain combined procedures, traditional open surgery provides better visualization and safer dissection. The right question is not 'minimally invasive or open' but 'which technique is best for this specific case.' A surgeon trained in both can make that decision honestly.

Which hand surgeries are routinely done minimally invasively?

Endoscopic carpal tunnel release and endoscopic cubital tunnel release are the most common endoscopic hand procedures. Both use small (usually under 1 cm) incisions with a fiber-optic camera to release the offending structure under direct vision. Trigger finger release uses an open A1 pulley release with a small 1 to 2 cm palm incision under local anesthesia, the most reliable approach for full pulley division and digital nerve protection. Wrist arthroscopy is used for wrist ligament repairs, TFCC tears, and synovectomy. Some Dupuytren's needle procedures are minimally invasive in concept though they do not use a camera. Many other hand operations remain open by design because they require direct exposure to perform safely.

What is the difference between single-port and two-port endoscopic carpal tunnel release?

Both achieve the same surgical goal: complete division of the transverse carpal ligament to relieve pressure on the median nerve. The single-port (Agee) technique uses one small wrist incision with a combined endoscope and cutting blade. The two-port (Chow) technique uses one wrist incision and one palm incision, with the endoscope in one port and the cutting blade in the other. Both techniques produce excellent outcomes when performed by experienced surgeons. The single-port approach is cosmetically appealing because it leaves only one small scar, but the two-port approach offers slightly better visualization in some anatomic configurations. Surgeon comfort with the chosen technique matters more than which port count is used.

What should I ask my surgeon about minimally invasive technique?

Ask: how often do you perform this procedure? What is your conversion rate to open surgery if the endoscopic approach cannot be safely completed? Are there reasons in my specific case that would make open surgery a better choice? What does the recovery comparison look like for your patients? A surgeon trained in both endoscopic and open techniques will answer these questions directly. A surgeon who only offers one approach is more limited in their ability to recommend the right one for your case. The conversion rate (how often the surgeon has to switch from endoscopic to open mid-procedure) is a particularly informative number; it reflects both case complexity and surgeon judgment.