What it is
Making room in a narrowed spinal canal — without an incision or an implant.
In lumbar spinal stenosis, the canal carrying the nerves through your lower back becomes narrowed. One of the most common reasons is that the ligamentum flavum — a band of tissue along the back wall of the canal — thickens with age and crowds the space the nerves need.
MILD treats that specific cause. Through a portal about the width of a pencil tip, small portions of the thickened ligament are removed under X-ray guidance, restoring space in the canal. Nothing is implanted, no bone is fused, and the surrounding structures are left intact.
Because there is no incision to close, there are no stitches. The procedure is done as an outpatient, typically with local anesthetic and light sedation rather than general anesthesia, and you go home the same day.
Who it's for
A specific pattern — worth recognizing in yourself.
Lumbar spinal stenosis has a distinctive presentation, and patients often describe it before they know its name:
Pain or heaviness when you walk
Aching, cramping, or weakness in the buttocks, thighs, or calves that builds the longer you stay on your feet. Often described as the legs simply giving out.
Relief when you sit down
Sitting or leaning forward opens the canal slightly and eases the symptoms — which is why many patients can walk much further with a shopping trolley than without one.
Shrinking walking distance
People often adapt without noticing: parking closer, avoiding shops, taking the car for distances they once walked.
Thickened ligament on imaging
MRI or CT showing that the ligamentum flavum is a significant contributor to the narrowing. This is what makes MILD appropriate rather than another approach.
MILD is generally considered after conservative care — activity modification, a directed rehabilitation plan, and often epidural steroid injections — has not given lasting relief.
When it isn't the right answer
Not all stenosis is the same stenosis.
This is the part that matters most, and the reason imaging review comes before any decision. MILD addresses narrowing caused by thickened ligament. It does not help narrowing caused mainly by something else.
Narrowing from a disc herniation
If a disc is the main problem, removing ligament will not relieve the pressure.
Significant instability
Where one vertebra has slipped on another to a degree that requires stabilisation, a decompression alone is not the answer.
Bone-dominant narrowing
Where overgrown bone rather than ligament is doing the crowding.
Back pain without leg symptoms
MILD treats the leg symptoms of stenosis. Back pain alone usually points to a different source — often the facet joints or the vertebral endplates.
How it compares
Between an injection and an operation.
Patients with stenosis are often presented with two extremes: keep having injections, or have spine surgery. MILD occupies the space between them.
Epidural steroid injection
Reduces inflammation around the compressed nerves. Often helpful, but it does not change the narrowing itself, so relief tends to be temporary.
MILD
Removes a portion of the thickened ligament, addressing the narrowing directly. No implant, no fusion, no general anesthetic, same-day discharge. It also does not rule out other options later — nothing is permanently altered that would prevent surgery if it becomes necessary.
Open decompression or laminectomy
A surgical procedure with a longer recovery, performed by a spine surgeon. Appropriate for more severe or structurally complex stenosis, and the right choice for some patients.
Which of these fits depends on what your imaging shows and how much your symptoms limit you. If surgery is the better answer for your situation, we will say so and refer you.
What the day looks like
About an hour, and home the same day.
Before
You lie face down. The skin is numbed, and sedation is available to keep you comfortable. St. Charles Surgical Center — 550 St. Charles Drive, directly across from our office.
During
Under continuous X-ray guidance, a small portal is placed and portions of the thickened ligament are removed. Contrast imaging confirms the space that has been created before we finish.
After
The portal site is covered with a small dressing — no stitches. You rest briefly, then go home with a driver. Soreness at the site for a few days is normal.
The following weeks
Walking is encouraged early and is part of the recovery rather than something to avoid. We will tell you what to build up to and how quickly, and we follow up to see whether your walking distance is actually changing.
Medicare coverage — one unusual detail
Covered nationwide, with a research condition attached.
Medicare covers this procedure across the country, but under a mechanism called Coverage with Evidence Development. In practical terms, coverage requires that your treatment be recorded as part of an approved Medicare study.
That sounds more involved than it is. You are not receiving an experimental treatment, and it does not change your care. It means anonymised information about your procedure and outcome contributes to an ongoing national study of how well this works — which is also how the evidence base continues to grow. Our office handles the enrolment paperwork.
Medicare Advantage plans are also responsible for covering procedures performed under this mechanism, though some require prior authorisation first. Commercial plans vary — we verify yours before scheduling. Call (805) 557-7050 and ask for extension 119.
[To confirm: the practice must be enrolled in an approved CMS study for Medicare coverage to apply — Wilson and Dr. Lin to verify enrolment status before this page goes live]
Honest limits
What MILD will not do.
It doesn't reverse the arthritis
The degenerative changes in your spine remain. What changes is how much room the nerves have.
It doesn't work for everyone
Some patients get substantial improvement in how far they can walk; others get less than they hoped, and some go on to need surgery. We discuss realistic expectations before, not after.
It's still a procedure with risks
Bleeding, infection, injury to the covering of the spinal cord or to a nerve, and the possibility that further treatment is needed. These are covered specifically in your consent conversation.
It doesn't replace the walking
Creating space is the intervention. Rebuilding the distance you can cover is the work that follows, and it matters as much as the procedure.
Common questions
What patients ask about MILD
If you've started planning your day around how far you can walk, that's worth an appointment.
Bring your MRI or CT images. Whether MILD fits depends on what is actually causing the narrowing — and that is something we can tell you.
Percutaneous lumbar decompression carries risks including bleeding, infection, injury to the dura or a nerve root, incomplete relief, and the possible need for further treatment or surgery. Results vary between patients, and this procedure is appropriate only for specific patterns of spinal stenosis. This page is general education, not medical advice. You are entitled to a clear explanation of the risks, the alternatives, and what happens if you choose to do nothing.