Minimally Invasive Lumbar Laminectomy

Most people with a narrowed spinal canal improve without surgery. When they don't, a keyhole laminectomy can free the squeezed nerves through a small tube, with less damage to the back muscles than open surgery. Most people walk the same day and go home the next.

Reviewed by Dr. Kshitij Chaudhary. Last reviewed October 2026

What is a minimally invasive lumbar laminectomy?

It's an operation to make more room for the nerves in your lower back. It's also called a keyhole or tubular decompression (MITR). The surgeon works through a narrow tube, which gently parts the muscles instead of cutting them. Then a small amount of the bone and thickened tissue pressing on the nerves is removed.

Why would my nerves need more room?

With age, the joints and ligaments in the spine can thicken and the canal narrows. The nerves get crowded. This causes leg pain, heaviness or numbness, often when you walk, and it eases when you sit or bend forward. ◾Lumbar Spinal Stenosis (Narrowing of the Spinal Canal in the Lower Back)

Who needs this surgery?

Most people don't. Medicines, physiotherapy and sometimes an injection help many patients. Surgery is worth discussing if:

• Your leg symptoms still limit walking or daily life after proper treatment
• Your MRI shows narrowing that matches your symptoms
• Your leg or foot is getting weak

If you've been told you need surgery and want to be sure, you can send us your MRI for a second opinion →

What conditions is it used for?

• Lumbar canal stenosis, where the central canal is narrowed
• Foraminal stenosis, where the side openings for the nerves are narrowed
• Synovial cysts pressing on a nerve
• Some slipped vertebrae. When a bone has slipped, decompression is sometimes combined with a fusion. ◾Spondylolisthesis (Slipping Vertebra)

Slipped discs are usually treated with a microdiscectomy, which is a similar but a separate operation. see Minimally invasive microdisectomy

Am I a good candidate?

It depends on your symptoms, your scan and your general health. Keyhole surgery suits many patients, but open surgery is sometimes better. This is true for several levels at once, a high-grade slip, or a repeat operation. We'll tell you which is right for you.

How is the operation done?

1. You're under general anaesthesia, so you're asleep throughout.
2. You lie face down. The surgeon makes a small cut over the narrowed level.
3. A tube is passed through the muscle down to the bone. The muscle is moved aside, not cut.
4. A microscope is used to magnify the anatomy several times.
5. Through the tube, the bone and tissue pressing on the nerves are removed.
6. The tube is withdrawn, the muscle settles back, and the skin is closed.

How is this different from open surgery?

Open laminectomy uses a longer cut and strips the muscles off the bone. The tubular method disturbs less muscle, so there's usually less wound pain, less blood loss and a quicker return to walking. The decompression of the nerves itself is the same.

How well does it work?

Leg pain, heaviness and walking distance usually improve. Numbness can take weeks to months to settle. Surgery works best for leg symptoms. If your pain is mostly in the back, it's not the answer, and we'll say so.

What are the risks?

Every operation has risks, and we'll go through them with you before you decide. They include:

• A small tear in the nerve covering, which usually heals with a short period of lying flat
• Symptoms that don't fully improve
• Narrowing returning over the years

Serious nerve injury is rare.

What is recovery like?

You usually get up and walk on the day of surgery and go home the next day.

Most people need little or no strong pain medicine afterwards. Call us if you notice fever, a red or leaking wound, new weakness in the leg, or trouble passing urine.

Questions to ask your surgeon

• Does my MRI match my symptoms?
• Have I tried enough non-surgical treatment?
• Is keyhole surgery right for my level and my scan?
• What result can I expect for my legs and for my back?
• When can I return to work and exercise?

This page is for general information. It doesn't replace advice from your own doctor.

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About Dr. Kshitij Chaudhary

This page was written by Dr. Kshitij Chaudhary, a fellowship-trained spine surgeon at P.D. Hinduja Hospital, Mumbai, trained in complex spine surgery at Harvard Medical School (Beth Israel Deaconess) and the Twin Cities Spine Center, Minneapolis. ⚕️About Dr. Chaudhary