"I saw an ad for a quick fix. Should I try that first?"
For most patients with lumbar spinal stenosis who have run out of conservative options, I recommend a tubular microdecompression over the MILD procedure. The reason is simple: MILD can only partially (and in a very limited way) remove one of the things that pinches nerves, while a tubular decompression lets me see and remove all of them.
I hear the question above in clinic all the time. Patients with leg pain and heaviness when they walk have seen ads for MILD, a percutaneous "no stitches" procedure for stenosis. It sounds like an easy first step. Sometimes it is reasonable. Often it isn't, and the reason comes down to anatomy.
What actually pinches the nerves in spinal stenosis
Lumbar spinal stenosis is narrowing of the space around the nerves in the lower back, and it is almost never caused by one thing. Several structures usually crowd the nerves at once:
Thickened ligamentum flavum, the "yellow" ligament that lines the back of the spinal canal
Enlarged facet joints and bone spurs, from arthritis in the small joints of the spine
A bulging or herniated disc pushing from the front
Narrowing at the side of the canal (the lateral recess) and in the openings where each nerve exits (the foramen)
Slippage of one vertebra on another (spondylolisthesis)
The typical symptom is neurogenic claudication: pain, numbness, or heaviness in the buttocks and legs when standing or walking, relieved by sitting or leaning forward. Which of these structures is doing the pinching, and where, determines which treatment can actually help.
What the MILD procedure does, and what it can't
MILD (minimally invasive lumbar decompression) is a percutaneous procedure that trims a thickened ligamentum flavum, and only that. It is usually done by an interventional pain physician under light sedation, through a small port placed with live X-ray guidance. Small tools shave away pieces of the ligament and a little bone at the edge of the lamina. There is no direct view of the nerves.
By design, MILD is meant for one specific pattern: stenosis in the center of the canal caused mainly by ligament thickening. Published guidance says it is not intended when the narrowing comes from other causes such as disc protrusion or slippage (ASRA). It cannot address bone spurs from the facet joints, narrowing at the side of the canal, or pinching where the nerve exits.
What the evidence shows. MILD is safe, with very low rates of nerve injury, and it is covered by Medicare. In the MOTION trial, patients who had MILD plus usual non-surgical care improved compared with usual care alone at one year (ClinicalTrials.gov). By two years, most patients in the comparison group had crossed over to MILD or other spine procedures, so the trial could not make a valid head-to-head comparison at that point (Deer et al., 2024). These studies compare MILD with non-surgical care or injections, not with surgical decompression, and they are funded by the device maker.
My honest summary: MILD is only a legitimate option for a very narrow group of patients. Its limits are anatomical and technical, not a matter of skill.
What tubular microdecompression does
Tubular microdecompression removes every structure that is compressing the nerves, under direct magnified view, through a 16 mm tube. I place a series of dilators through a small incision that gently spread the back muscles apart rather than cutting them, then dock a 16 mm tube on the spine. Through it, using a surgical microscope, I can see the nerves directly.
From one side, I can angle across and decompress both sides of the canal. This technique is called unilateral laminotomy for bilateral decompression. It lets me remove:
Thickened ligament
Facet bone spurs and overgrown joint capsule
Narrowing in the lateral recess and foramen
A disc fragment, if one is contributing
Most patients go home the same day or the next morning, walking. See Spine Surgery Recovery Timelines for typical return to work and activity.
What the evidence shows. Unilateral-approach decompression has been studied for more than two decades. In one series of 133 patients followed for an average of 5.6 years, 92% of those available for long-term follow-up remained improved, with a 9.8% complication rate (Oertel et al., Neurosurgery 2006). A prospective study found it effective even in older, higher-risk patients with stenosis at several levels (Neurosurgery 2009). Much of this literature is case series rather than randomized trials, but the results are consistent with traditional open decompression while disrupting far less normal tissue.
Side by side
Who performs it: MILD, usually an interventional pain physician. Tubular, a spine surgeon.
Anesthesia: MILD, light sedation. Tubular, general anesthesia.
How the physician sees: MILD, X-ray guidance only. Tubular, direct view through a microscope.
Thickened ligament: both address it.
Facet bone spurs: MILD no. Tubular yes.
Side-of-canal and foraminal narrowing: MILD no. Tubular yes.
Disc contribution: MILD no. Tubular yes.
Incision: MILD about 5 mm. Tubular about 2 cm.
Typical recovery: MILD, days. Tubular, one to a few weeks.
Best evidence: MILD, randomized trials against non-surgical care and injections. Tubular, long-term series with results similar to open surgery.
Who might reasonably choose MILD, and why I usually recommend tubular decompression
MILD can make sense for a patient whose MRI shows central stenosis driven mainly by a thick ligament, with little bone or disc involvement, and who is a poor candidate for general anesthesia. For that patient, a sedation-only procedure with a fast recovery is potentially a fair trade.
That isn't the typical patient I see. Most people with symptomatic stenosis have narrowing from several sources at once, often including the facet joints and the side of the canal. Trimming the ligament alone leaves the rest of the compression in place. When that happens, patients may get partial relief, or none, and end up needing surgery anyway after months of delay.
A tubular decompression addresses the whole problem in one operation, with a small incision and a short recovery. That is why, for most of my patients who have exhausted physical therapy, medication, and injections, it is the procedure I recommend.
We always look at the MRI together, and I walk each patient through the anatomy, what is causing the pain, and why I think a proposed procedure will work.
It also matters who you ask: a spine surgeon who offers the full range of care, from physical therapy and injections to decompression and fusion, can match the treatment to your anatomy rather than to the one procedure they perform.
Training is part of that. Interventional pain physicians are typically trained in anesthesiology or rehabilitation medicine, followed by a one-year pain fellowship centered on needle-based procedures, and many are excellent at what they do. Spine surgeons spend five to seven years of residency, plus fellowship, operating directly on the spine and the nerves around it. If a procedure meant to decompress your spine runs into bleeding, a tear in the lining around the nerves, or compression that wasn't fully relieved, you want the person in the room to be someone who can recognize it, see it directly, and fix it on the spot.
The bottom line
The right procedure depends on what is pinching your nerves, and only your imaging and exam can answer that. Before choosing any procedure for stenosis, ask the physician to show you on your MRI what is causing the narrowing and how their procedure will remove it.
If you have leg pain or heaviness when walking and are weighing your options, I see patients at Virtua Reconstructive Orthopaedics in Sewell and Cherry Hill, New Jersey. Call (609) 267-9400 to schedule. Related: Spinal Stenosis · Understanding Your Spine MRI · Spine Surgery Second Opinion
This article is for general education and is not medical advice. Treatment decisions should be made with a physician who has examined you and reviewed your imaging.
