Do I need to stop my blood thinner before MILD?

Usually yes, with hold instructions coordinated with your prescribing physician. The procedure cannot be done on full anticoagulation.

MILD Procedure Hoffman Estates IL | Dr. Keith Schmidt MD

MILD® Procedure for Lumbar Spinal Stenosis in Hoffman Estates, IL

I evaluate a lot of patients in my Hoffman Estates practice who have been told the same thing for years: “Walk less. Sit more. Take this medication. Wait for the laminectomy.” Most of them don’t want spine surgery. Most of them also can’t keep losing function. The MILD procedure — minimally invasive lumbar decompression — is the option that sits in between those two extremes, and for the right patient it is genuinely life-changing. The honest version is this: MILD is not for everyone, but when the imaging fits and the symptoms fit, it offers real decompression with a Band-Aid-sized incision and an outpatient afternoon.

This page is the clinical deep dive. If you want the patient-side primer with the exact questions to ask before you book the procedure, read the longer companion article: Questions to ask before the MILD procedure.

What MILD actually is

MILD stands for minimally invasive lumbar decompression. It is a percutaneous procedure — meaning we work through a tiny portal, not an open incision — designed to treat one very specific anatomic problem: a thickened ligamentum flavum that is crowding the central canal of your lower spine. Using fluoroscopic (live X-ray) guidance and specialized instruments through a roughly 5–6 mm cannula, I remove portions of that hypertrophied ligament and small pieces of bone to restore space for the nerves. No general anesthesia. No hardware. No fusion. No stitches.

That last point matters. MILD does not change the architecture of your spine. There is nothing implanted, nothing removed that affects stability, and no recovery from open surgery to navigate. It is, in the spectrum of options, the lighter touch — a surgical procedure performed in a procedure suite, not an operating room, with a same-day discharge.

Who is a candidate?

This is where most of the patient-facing copy on the internet gets vague. I won’t.

You are a strong MILD candidate if you meet both of these criteria:

Diagnosis of lumbar spinal stenosis with neurogenic claudication. That means leg pain, heaviness, cramping, or weakness that comes on with standing or walking and is relieved by sitting or leaning forward (the classic “shopping cart sign”). Pure back pain without leg symptoms is a different problem.
Ligamentum flavum hypertrophy of ≥2.5 mm on MRI. This is the anatomic gate. The MILD device is specifically designed to debulk a thickened ligamentum flavum, so if your imaging shows that ligament is the dominant cause of canal narrowing, the procedure has something to do. If your stenosis is purely bony or driven by disc herniation, MILD is not your answer.

Without both of those criteria, MILD is not the right procedure. Full stop. I have turned away patients who came in asking for it specifically because their MRI showed minimal ligament involvement and significant facet hypertrophy or spondylolisthesis — the procedure would not have helped them, and I won’t do a procedure that won’t help.

A few additional factors I weigh: How much function has the patient lost? A person who used to walk three miles and now can’t make it to the mailbox is a different decision than someone with mild discomfort after long shopping trips. I also look at age and surgical risk tolerance — many of my MILD patients are in their 70s and 80s on anticoagulants with cardiac histories that would make laminectomy unappealing. MILD’s safety profile is what makes it attractive in that population.

What fails before MILD

I don’t recommend MILD as a first move. Before a patient gets to my procedure schedule, we have almost always already tried:

Physical therapy focused on flexion-biased exercises, hip strengthening, and walking tolerance. This helps a real subset of stenosis patients and should be tried first.
Oral medications — acetaminophen, NSAIDs when safe, sometimes gabapentinoids for the neurogenic component. The honest version: medications rarely solve stenosis. They reduce inflammation and take the edge off.
Epidural steroid injections — usually one or two, sometimes a series. Some patients get months of relief; some get weeks; some get none. When the relief gets shorter with each injection, that’s the signal that we’re outrunning the conservative path.

If you’ve worked through those steps and you’re still losing walking distance, MILD becomes a serious conversation. It is the next step before — not instead of — a laminectomy discussion. The framing I use with patients: MILD is the lighter touch with faster recovery, still surgical, that lets us see whether decompression solves your problem before we commit to a more aggressive operation.

What the procedure looks like

Day-of-procedure is shorter than most people expect. You’ll arrive at the procedure suite a couple of hours before your scheduled time. We confirm your medications (especially any blood thinners — we coordinate hold instructions with your prescriber in advance), place an IV, and review the consent in person. No food after midnight is the standard ask.

You’ll lie face-down on the fluoroscopy table. I use IV moderate sedation — twilight, not general anesthesia — combined with generous local anesthetic at the access point. Most patients are sleepy but responsive throughout. We confirm the target level with live X-ray, mark the access point on your skin, and inject the local. Once the area is numb, I make a small entry — roughly the size of a pencil tip — and advance the working cannula to the lamina under fluoroscopic guidance.

The decompression itself is the part most patients ask about. Using the MILD bone-rongeur and tissue-sculpter instruments through that single small portal, I remove targeted portions of the thickened ligamentum flavum and small bone fragments from the underside of the lamina. We use contrast under fluoroscopy to confirm we’ve restored space in the canal — watching the contrast spread fill the previously crowded area is one of the more satisfying parts of the case. The procedure itself usually takes about 30 to 45 minutes from access to closure.

Closure is a single small adhesive strip — no stitches. You’ll be observed in recovery for an hour or two, walked to the bathroom to confirm you’re mobilizing safely, and discharged home the same afternoon with a responsible driver.

Recovery and what to expect

The first 24 hours are usually the most cautious. I want you walking — short distances, level surfaces, around the house — but no lifting over 10 pounds, no driving until the next day, and no heavy activity. Most patients describe soreness at the access site rather than the sharp post-surgical pain they were expecting.

The first week, we ease back into normal activity. Walking is encouraged from day one. Most patients are back to desk work within 2 to 3 days and feeling close to their baseline by the end of the first week. I tell my more active patients — and yes, the irony isn’t lost on me as a triathlete — that we hold off on swimming, cycling, and running for two weeks, and then add structured exercise back gradually. By 4 to 6 weeks the majority of MILD patients have realized whatever functional improvement they’re going to get, and we measure success not in pain scores alone but in walking distance and standing tolerance. Those are the numbers that matter in stenosis.

Risks

MILD’s safety profile is one of its strongest selling points, but I am honest about risk in every consent conversation. Common, expected, and self-limited: access-site soreness, temporary muscle ache, mild bruising. Uncommon but possible: persistent pain at the access site, no improvement in symptoms (the procedure works, but didn’t help enough to change the patient’s life), and small bleeding from the access. Rare but serious: dural tear with CSF leak, infection requiring antibiotics, and — vanishingly rare in published series — nerve injury. The MOTION trial reported no device-related serious adverse events through two years of follow-up, which is the kind of safety data that lets me offer this procedure with confidence to older, medically complex patients.

Alternatives and how I decide

This is the conversation that wins the patient’s trust, because most of the patients in my office have been told they need a laminectomy and want to know whether they can avoid it.

MILD versus continued epidural injections. When a patient’s relief from each injection is getting shorter — six months, then four, then two — the injection ladder is running out. MILD addresses the anatomic problem rather than the inflammation around it. I generally make this move when we’re below 3-month relief per injection.

MILD versus open laminectomy. Laminectomy is more decompression. It also brings more recovery, more anesthesia risk, and a small but real risk of post-surgical instability that occasionally requires fusion. I lean toward MILD when the imaging shows ligament-dominant stenosis at one or two levels, the patient is older or medically complex, or the patient wants to try the lighter option first knowing they can still escalate to laminectomy if needed. I lean toward laminectomy when there is significant bony stenosis, spondylolisthesis with instability, severe multilevel disease, or a younger patient who needs maximal decompression and can tolerate the bigger procedure. The honest version: MILD does not preclude a future laminectomy. Patients who don’t get enough relief from MILD can still proceed to surgery without their options being narrower.

MILD versus interspinous spacers. Spacers are another minimally invasive option for stenosis. I have lower enthusiasm for them in most of my patients because the evidence base is weaker and the failure-to-relief rates are higher than the published MILD data. There are specific cases where I’ll consider them, but they are not my default.

Evidence I rely on. The MOTION trial (Staats et al., Pain Practice, 2022, PMID 35020922) reported two-year outcomes showing sustained functional improvement and zero device-related serious adverse events in MILD patients compared to conventional care. The earlier Benyamin et al. study (Pain Physician, 2016, PMID 27008295) demonstrated significant pain and function improvements out to one year. I cite both because they cover different patient populations and time horizons, and together they form the basis for current Medicare coverage.

Insurance

This is the part that has changed materially in the last few years, and most patients don’t know it. Medicare now covers MILD when the documented criteria are met — confirmed lumbar spinal stenosis with neurogenic claudication, MRI evidence of ligamentum flavum hypertrophy ≥2.5 mm, and documentation of failed conservative therapy. Many commercial insurers have followed Medicare’s lead. My office handles the prior authorization documentation, and what helps the approval most is a clean MRI report explicitly measuring the ligamentum flavum and a clear paper trail of the conservative care that came first. If you’re bringing imaging from elsewhere, ask for the report to specifically note ligamentum flavum thickness — radiologists don’t always include that measurement unless asked.

FAQ

Is MILD considered spine surgery? It is a percutaneous surgical procedure, performed in a procedure suite under fluoroscopic guidance with a small portal. It is not open spine surgery. There is no general anesthesia, no fusion, no hardware, and no overnight stay. Most patients distinguish it from “real surgery” because the recovery profile is so different.

How long does the relief last? The MOTION trial’s two-year data is the most rigorous answer we have, and it shows sustained improvement out to that mark for the majority of patients. Longer-term registry data continues to track durability. Honest framing: this is decompression of a structural problem, so the relief tracks with whether the anatomy stays decompressed.

Can I have MILD if I’ve already had a laminectomy? Sometimes. It depends on what the imaging shows now and where the residual ligamentum flavum is. Post-laminectomy patients need a careful look at scar tissue and adjacent-level stenosis before I’ll consider it.

Can MILD be repeated? Yes, at a different level or a previously untreated level. Re-treating the same exact spot is uncommon because once the ligament is debulked, regrowth at that location is not the typical failure mode.

What if MILD doesn’t work for me? You still have every option you had before. Laminectomy remains on the table, and many surgeons consider a prior MILD a non-issue technically. That’s part of why I’m comfortable recommending the lighter procedure first in many patients.

Do I need to stop my blood thinner? Usually yes, with hold instructions coordinated with your prescribing physician — typically your cardiologist or primary care doctor. We don’t dictate those holds; we coordinate them. The procedure cannot be done on full anticoagulation.

If you’re considering MILD

If you’ve been told you need a laminectomy for lumbar spinal stenosis, or your epidural injections are losing their grip, it is worth getting a second opinion before you commit to a bigger operation. I evaluate every MILD candidate personally, look at the actual imaging, and tell you honestly whether the procedure fits your anatomy. Call my Hoffman Estates office at (847) 981-3630 to schedule a consultation, or read the longer companion piece — Questions to ask before the MILD procedure — before your visit.