Lumbar spinal stenosis is a narrowing of the space the spinal nerves travel through in the lower back. The nerves themselves are usually healthy. What changed is the room they have.
That distinction is the whole of the condition. Stenosis does not damage a nerve the way a laceration does; it crowds it, and crowding is positional. That is why the same person can walk almost nothing in a parking lot and push a cart through an entire supermarket, and why the story a patient tells is often more diagnostic than the scan.
Three structures do most of the crowding, usually in combination:
Some people start with less room than average. A congenitally narrow canal is not a disease in itself, but it lowers the threshold at which ordinary age-related change becomes symptomatic — which is why a 45-year-old can present with claudication that a 75-year-old with worse-looking films does not have.
Where the narrowing sits matters as much as how much of it there is. Central stenosis crowds the canal itself and tends to produce symptoms in both legs. Lateral recess and foraminal stenosis pinch a single nerve root on its way out and behave much more like sciatica, in one leg, following one nerve.
Acquired stenosis is a condition of the aging spine, and it is common. According to PubMed, a Framingham Heart Study analysis of community CT scans found acquired relative narrowing of the canal in 22.5 percent of participants overall and absolute narrowing in 7.3 percent — but the age gradient is the useful part. Under 40, those figures were 20.0 percent and 4.0 percent. Between 60 and 69, they were 47.2 percent and 19.4 percent (Kalichman L, et al. Spine J. 2009; DOI).
Two things follow from that. Nearly half of people in their sixties have some measurable narrowing, so finding it on your scan does not by itself explain your pain. And in the same Framingham dataset, absolute stenosis was one of the few degenerative findings that did track with reported low back pain, with roughly a threefold association (odds ratio 3.16, 95% CI 1.05–9.53). Stenosis is common and it is one of the degenerative findings most worth taking seriously — both are true, and holding both is what keeps a diagnosis honest.
Metabolic health sits underneath this in a way that is routinely left out. Insulin resistance, visceral adiposity and chronic inflammatory load change how ligament and cartilage remodel and how well nerve tissue tolerates being compressed. That is why this practice evaluates and treats those drivers alongside the structural problem rather than sending them elsewhere.
Patients rarely arrive saying “my canal is narrow.” They say some version of this:
That pattern has a name: neurogenic claudication. Flexion opens the canal; extension closes it. When a patient describes their own posture as the treatment, they are describing the mechanism.
The differential that matters most here is vascular claudication, from arterial disease in the legs. It also produces leg pain with walking. It does not care what your spine is doing — sitting is not required, standing still is fine, and leaning on a cart changes nothing. Pulses, skin, hair growth and, where indicated, vascular testing sort it out. Getting this wrong in either direction costs a patient years.
New or worsening weakness in a leg, numbness in the saddle area, or any change in bowel or bladder control is not an elective problem. That combination can indicate cauda equina compression, which is evaluated urgently, not scheduled. Call us at (314) 481-5000 or go to an emergency department.
The sequence is deliberately diagnostic before it is therapeutic, and it runs in this order.
History and examination first. Walking tolerance, what position relieves it, how long recovery takes when you sit, whether it is one leg or two. Examination adds reflexes, strength testing, straight-leg raise, and provocative maneuvers that load specific structures. Extension of the lumbar spine reproducing leg symptoms, and flexion relieving them, is worth more than most people assume.
Imaging read against the symptoms, not in isolation. MRI shows the anatomy well. It also shows narrowing in a great many people who have no symptoms at all, which is exactly why the report is not the diagnosis. The question is never “is there stenosis on the film” — it is “does the level and side of the narrowing explain what this patient describes.” Where they disagree, the disagreement gets resolved before anything is treated. Our guide to what each imaging modality can and cannot tell you covers this in more detail.
Diagnostic blocks where the source is still ambiguous. Older spines usually contain several plausible pain generators at once — stenosis, degenerated facet joints, a sacroiliac joint, a hip. A small volume of local anesthetic placed precisely under fluoroscopic or ultrasound guidance either abolishes the pain temporarily or does not, and that is a test with an answer rather than an opinion. An epidural steroid injection or a selective nerve root block can serve both purposes at once — localizing the generator while treating it.
Nerve testing where the picture is mixed. When symptoms could be coming from the spine or from a peripheral neuropathy — common in patients with diabetes — EMG and nerve conduction studies separate the two rather than leaving it to inference.
Care is sequenced, and the sequence is not a formality.
Conservative care. Targeted physical therapy — flexion-biased work, hip and core conditioning, graded walking within tolerance — plus the metabolic drivers that accelerate degeneration. Medical weight management and lifestyle medicine are treatment for this condition, not adjuncts to it: less axial load and less inflammatory drive change the trajectory of the underlying process, which no injection does.
Image-guided injections. Epidural steroid injections reduce inflammatory swelling around a crowded nerve and often restore walking distance for a period. They are done under local anesthetic with no sedation — patients are awake, drive themselves home, and resume normal activity, including work, within two to four hours.
Decompression without an implant. Where the dominant compression is a thickened ligamentum flavum, the MILD procedure removes a portion of that ligament through a portal smaller than the diameter of a dime, under live X-ray guidance. It applies to that specific mechanism and not to stenosis driven mainly by a large disc herniation, by bony lateral recess overgrowth, or by spondylolisthesis with instability — establishing which stenosis you have is the whole of candidate selection. That page covers the evidence, sedation and recovery details in full.
Neuromodulation. For patients whose leg pain persists despite adequate decompression, or who are not candidates for one, spinal cord stimulation is a further option, tested with a trial period before anything is implanted.
Surgery is squarely on the table for lumbar spinal stenosis, and Dr. Gurpreet Singh Padda, MD, MBA, MHP is a licensed physician and surgeon with surgical privileges. The honest position is about sequence and selection, not about whether operations work.
Open decompression is the appropriate answer when there is a progressive neurological deficit, when cauda equina compression is present, or when severe stenosis has resisted a genuine course of conservative and interventional care and is limiting a life. It is not the appropriate answer to an MRI report in a patient whose symptoms have not been matched to the finding.
The comparative evidence deserves to be stated plainly rather than spun in either direction. According to PubMed, a Cochrane review of five randomized trials in 643 patients found no significant difference between surgery and multimodal non-operative care on disability at six months or one year, a difference favoring decompression at 24 months, and rated all of this low-quality evidence. The same review recorded side effects in 10 to 24 percent of surgical cases and none reported in the conservative arms (Zaina F, et al. Cochrane Database Syst Rev. 2016; DOI).
What those trials could not capture is worth knowing before you weigh them. They tested single strategies against each other, not sequenced care. Their follow-up windows are short relative to how long people live with this condition. And randomized spine trials routinely exclude the patients who fill this practice — multiple pain generators at once, significant metabolic disease, prior spine surgery, complex medication histories. A trial result derived from a cleaner population is a starting point for a conversation about your spine, not a prediction about it.
The practical consequence: the least invasive intervention that can answer your specific mechanism is tried first, because every option that preserves later options is worth preserving. Where that is not enough, surgery follows — and it follows as a decision made with you, on findings that have been confirmed.
If your legs give out after a set distance and recover when you sit, that is a specific, diagnosable pattern and it is worth naming. We see patients from across St. Louis, Bridgeton, Florissant, St. Charles and the Illinois Metro East. Call (314) 481-5000 or request an evaluation.
Because leaning forward physically enlarges the spinal canal and standing upright closes it down. The cart is doing the same thing a flexed posture does — buying your nerves room. It is one of the most reliable clues in spine medicine, and it is the reason walking tolerance is a better measure of your stenosis than a millimeter measurement on a report. Read more: Spinal stenosis and leg pain when walking.
Not on its own. Narrowing is present in a large share of people over 60 who have no symptoms whatsoever, so the report describes anatomy rather than a treatment decision. What determines the plan is whether the level and side of the narrowing account for what you actually experience, and whether less invasive options have been genuinely tried. Read more: On the volume of back surgery performed in the US.
Both produce leg pain brought on by walking, and they are separated by what relieves it. Spinal claudication needs a change in spine position — sitting, or leaning forward — and improves within minutes of it. Vascular claudication improves with rest in any position and is unaffected by posture. Examination and, where indicated, vascular testing settle it rather than leaving it to guesswork. Read more: Spinal stenosis and leg pain when walking.
No, and it is worth being precise about what they do. They reduce inflammatory swelling around a compressed nerve, which frequently restores walking distance for a period and tells us whether that nerve is in fact the source. They do not remove the tissue that is causing the narrowing. That is why the response to an injection informs what comes next rather than ending the discussion. Read more: How an epidural steroid injection actually works.
For injection procedures, no. They are performed under local anesthetic with no sedation, so you are awake and responsive throughout and most patients drive themselves home and resume normal activity within two to four hours. The exception is temporary leg weakness or numbness, which an epidural can occasionally cause and which resolves — if it happens, we wait it out with you. Procedures that do use mild sedation, such as the MILD decompression, require a driver and we tell you that in advance. Read more: What to expect at your first appointment.
Not necessarily on any fixed schedule, and not in a straight line. Symptoms fluctuate, and walking distance can improve substantially with treatment even though the anatomy has not changed. What is reliably progressive is the underlying degenerative and metabolic process, which is one of the reasons this practice treats blood sugar, weight and inflammatory load as part of spine care rather than as somebody else’s department. Read more: How hyperinsulinemia drives chronic pain.
Almost never, and the instinct to stop usually makes things worse. Deconditioning reduces the muscular support the spine depends on and raises inflammatory load independently. The practical approach is walking within your tolerance and building from there, often with a flexion-biased program, rather than waiting for the pain to permit it. Read more: Walking as treatment for low back pain.
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