MILD [Minimally Invasive Lumbar Decompression] Procedure for Spinal Stenosis in St. Louis

MILD — minimally invasive lumbar decompression — treats one exact cause of lumbar spinal stenosis (a narrowed spinal canal in the low back). That cause is a thickened ligamentum flavum pressing on the canal from behind.

The cut is smaller than a dime across. Guided by live X-ray, the doctor removes a small piece of the overgrown ligament and a sliver of bone. That opens space in the canal. There is no implant, no general anesthesia, and the spine stays stable. Medicare calls it percutaneous image-guided lumbar decompression, or PILD.

Here is the difference that matters. MILD is indirect decompression, done through a small port while the doctor watches on X-ray. It is not open surgery where the surgeon looks right at the spine. Traditional laminectomy and endoscopically assisted laminotomy are different procedures. They carry different risks, a different recovery, and a different insurance status entirely.

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Lumbar spinal stenosis is the most common reason older adults have spine surgery. The classic pattern is neurogenic claudication. Your legs ache, burn, or go heavy after a few minutes of walking. They settle when you sit or lean forward over a cart.

That leaning gives it away. Bending forward opens the spinal canal; standing up straight closes it. If you can walk a grocery store with a cart but not a parking lot without one, you are describing stenosis.

MILD [Minimally Invasive Lumbar Decompression] only treats stenosis caused by ligamentum flavum hypertrophy (an overgrown ligament). It will not help stenosis from a large disc herniation. It will not help spondylolisthesis with instability, where one bone slips on another. It will not help when the main problem is bony overgrowth in the lateral recess (the side channel where the nerve exits). Finding out which stenosis you have — through an exam and a review of your scans, not a guess — is the whole job of picking the right patients.

The honest answer: the evidence is positive, consistent, and moderate in quality. It is not the deep record of an operation that has been done for decades. We say so rather than oversell it.

A 2025 systematic review and meta-analysis in Pain Physician pooled 12 clinical trials covering 500 patients. It found a statistically significant drop in pain scores and in Oswestry Disability Index scores from where patients started. Side effects were low compared with other surgical ways to open the canal. The authors conclude MILD is effective and safe. They also clearly call for more well-designed randomized trials.

A 2023 review in the Journal of Pain Research put ranges on it. Pain scores on a visual analog scale fell from 6.3–9.6 before treatment to 2.3–5.8 after. Oswestry Disability Index scores fell from 38.8–55.3 to 27.4–39.8. Reported success rates ran 57–88 percent, and the benefit held steady at two years. One randomized trial in that review found MILD [Minimally Invasive Lumbar Decompression] worked better than an epidural steroid injection.

Those success ranges are wide — 57 to 88 percent — and the reason matters. The studies did not use the same rules for who got in and who was left out. They did not set what conservative (non-surgical) treatment came first or for how long. Results were scored by the patients themselves, which is open to bias. Current research does not show how well it works beyond about two years.

Trials like these also routinely leave out the patients we see most. That means people with serious metabolic disease, several pain sources at once, past spine surgery, or a long, tangled list of medicines. A 57–88 percent range from cleaner study groups is a starting point for a talk about your spine. It is not a prediction about it.

Ruling MILD [Minimally Invasive Lumbar Decompression] out is as much of the work as ruling it in. It is usually not the right choice when:

• The stenosis is not mainly caused by a thickened ligamentum flavum
• There is spondylolisthesis with instability, where opening the canal alone can make the slip worse
• A large disc herniation or bony lateral recess stenosis is the main source of pressure
• Cauda equina syndrome, nerve loss that keeps getting worse, or bowel or bladder trouble is present — these are urgent, and are not handled with a planned same-day procedure
• There is active infection, an unfixed bleeding risk, or a blood thinner that cannot be safely paused
• The scans and the symptoms do not match, and that gap has not been settled

MILD [Minimally Invasive Lumbar Decompression] is done as a same-day procedure with local anesthetic and mild sedation. No implant is left behind. There is no fusion and no general anesthesia.

Here is the order. We place an IV and give a light sedative. You lie on the procedure table, and we numb your back with a local anesthetic. The canal is opened through a small port, guided by live X-ray. Most patients go home the same day.

Because mild sedation is used, arrange for someone to drive you home. That rule is just for this procedure — most of our shot-based treatments use no sedation at all, and those patients drive themselves.

Afterward, keep the site clean and dry. Plan on a follow-up visit within five to ten days, so we can check the result in person, not over the phone. Do not lift anything over 20 pounds for two weeks. That is the main limit, and it is short — MILD leaves no implant and no cement, so nothing has to set before you go back to normal loads.

Keep that two-week window in mind when you compare options. A fusion locks you into months of limited lifting while the bone knits. MILD does not, because nothing was fused.

Medicare’s national coverage determination for percutaneous image-guided lumbar decompression covers this procedure only for patients enrolled in an approved clinical study. At this practice, MILD [Minimally Invasive Lumbar Decompression] is offered as a self-pay service. You are told that before anything is scheduled. You sign an advance beneficiary notice, so you have it in writing before you commit to anything. Private insurance plans vary, and we check each one.

That is a payment decision, not a medical one. A coverage ruling says what a payer will fund. It is not a finding on whether a procedure helps a given patient. It does not change the published results above. The two questions are truly separate, so be clear about which one you are asking.

We do not publish prices, because what each patient needs is set at the evaluation and it varies. Call (314) 481-5000 and we will tell you plainly what applies to you before you decide anything.

MILD [Minimally Invasive Lumbar Decompression] is not a first step, and it is not a last resort.

We start with conservative care — changing activity, physical therapy, and treating the metabolic drivers that make spine wear worse. When that is not enough, image-guided epidural steroid injections are used both to treat the pain and to pin down where it comes from.

Published research backs not getting stuck at that stage. A 2021 study in Pain Management looked at patients before MILD. Some had one or no epidural steroid injection. Others had two or more. Results were similar in both groups. The authors concluded that repeat shots beforehand did not improve results and may have delayed care.

Surgery is still on the table, and this practice performs it — Dr. Gurpreet Singh Padda, MD, MBA, MHP is a licensed physician and surgeon with surgical privileges. For lumbar spinal stenosis, MILD sits between shots and open surgery. It is a smaller step that keeps every later option open, including spinal cord stimulation, because nothing is implanted and no load-bearing bone is weakened.