Lumbar Spinal Stenosis

Our Specialists for Lumbar Spinal Stenosis

Lumbar spinal stenosis is a condition where the details matter. How many levels, whether there's instability or spondylolisthesis, and how much of the canal is actually narrowed all change the right answer. Our spine surgeons see stenosis patients every week and tailor the operation to your anatomy rather than defaulting to a single technique.

Mohamad Bydon, M.D.

Chair, Department of Neurological Surgery

Dr. Bydon is the Chair of Neurological Surgery at UChicago and a pioneer in minimally invasive and robotic spine surgery. He led the stem cell trial, the first-in-human stem cell therapy for spinal cord injury, and holds 12 medical device patents with over 600 peer-reviewed publications. He was recruited to UChicago from Mayo Clinic. Dr. Bydon's published cohort of 500 lumbar laminectomies documented significant, durable improvements in back pain, claudication, radiculopathy, and weakness after decompression for stenosis (Surgical Neurology International, 2015), and he was a senior author on the Quality Outcomes Database analysis showing that laminectomy alone and laminectomy-plus-fusion both improve outcomes for grade 1 spondylolisthesis (J Neurosurg Spine, 2018).

Martin Herman, M.D., Ph.D.

Program Director, Neurological Surgery Residency

Dr. Herman is Program Director of the Neurological Surgery Residency and a complex spine surgeon who practices the full spectrum of spine and neurorestoration procedures. He co-developed a fully implantable wireless intraspinal microstimulation device for restoring motor function after spinal cord injury, with publications in Artificial Organs and Scientific Reports. He has been named a Top Chicago Doctor for over a decade. Dr. Herman is one of the spine surgeons who sees lumbar stenosis patients weekly at UChicago, and he favors a tissue-sparing, minimally invasive decompression whenever the anatomy allows — reserving fusion for the minority of patients with true instability.

Timothy F. Witham, M.D., FACS

Section Chief, Spine Surgery

Dr. Witham is Section Chief of Spine Surgery at UChicago and a pioneer in augmented reality-guided spine surgery. In 2020 he performed the first FDA-cleared AR-guided spine surgery on a living patient using the xvision system, and he has published extensively on AR-assisted pedicle screw placement. He came to UChicago from Johns Hopkins, where he was Professor of Neurological Surgery and Orthopaedic Surgery and served as co-program director of the neurosurgery residency. Dr. Witham was a co-author on the 500-patient laminectomy outcomes series with Dr. Bydon (Surgical Neurology International, 2015) and has built his practice around complex degenerative and deformity cases — the patients for whom the decision about whether, and how much, to fuse is the hardest part of the operation.

What Is Lumbar Spinal Stenosis?

Lumbar spinal stenosis is the gradual narrowing of the spinal canal in your lower back. Your spinal canal is the bony tunnel that protects the nerves running from your spinal cord down to your legs and pelvis. As you age, the discs flatten, the ligaments thicken, and the small joints at the back of the spine (facet joints) enlarge — and all of those changes can press in on the space those nerves need.

When the nerves get pinched, they don't always hurt where you'd expect. Instead of back pain, many people feel heaviness, cramping, or burning in the legs when they walk or stand for more than a few minutes. The classic tell is the "shopping cart sign" — you can walk much farther at the grocery store leaning forward on a cart than you can walking upright, because leaning forward opens the canal and takes pressure off the nerves.

Stenosis is extremely common. It's the most common reason adults over 65 in the United States have spine surgery, and imaging studies find some degree of narrowing in a majority of people over 60 — though many of them have no symptoms at all. That gap between what the MRI shows and what you actually feel is one of the most important things to understand about this condition.

What Does It Feel Like?

Lumbar stenosis has a recognizable pattern that neurosurgeons call neurogenic claudication. It's different from ordinary back pain, and it's different from sciatica caused by a disc herniation.

The classic pattern

• Leg pain, heaviness, cramping, or burning that comes on with walking or prolonged standing
• Symptoms get worse going downhill and better going uphill (because you naturally lean forward going up)
• Leaning on a shopping cart, a walker, or a kitchen counter relieves the symptoms within a minute or two
• Sitting down almost always helps — many patients can ride a stationary bike for 30 minutes but can't walk a single block
• Numbness and tingling in the thighs, calves, or feet, often on both sides
• A feeling that the legs are "giving out" or that you're walking on wooden stumps

What it usually is NOT

• Severe back pain as the dominant symptom. Most people with stenosis have more leg trouble than back trouble.
• Pain that wakes you up at night when you're not moving
• Sudden onset over days. Stenosis builds over months to years.

Red flags that need urgent evaluation

• New loss of bladder or bowel control
• Numbness in the saddle area (the part of your body that touches a bicycle seat)
• Rapidly progressive weakness in the legs

Any of those symptoms could mean cauda equina syndrome, a rare but serious emergency. If you develop them, go to an emergency department — don't wait for a clinic appointment.

How Is It Diagnosed?

The diagnosis of lumbar spinal stenosis starts with the story, not the scan. A surgeon who sees stenosis every week can usually predict what the MRI is going to show after ten minutes of conversation — because the pattern of walking tolerance, postural relief, and leg symptoms is so specific.

Physical exam

On exam, your surgeon will check your strength, reflexes, sensation, and pulses, watch you walk, and test whether bending forward and backward reproduces your symptoms. Checking the pulses matters because vascular claudication (blocked arteries in the legs) can mimic stenosis almost exactly, and the treatment is completely different.

MRI

The definitive test is an MRI of the lumbar spine. MRI shows the soft tissues — the discs, the ligaments, and the actual space around the nerves — in a way that a CT scan or X-ray cannot. Your surgeon will look at how narrow the canal is at each level, whether the narrowing is in the center (central stenosis), in the side pockets where individual nerve roots sit (lateral recess stenosis), or at the holes where the nerves exit the spine (foraminal stenosis).

Standing X-rays

If there is any suspicion of instability or slippage (spondylolisthesis), your surgeon will order flexion and extension X-rays, taken with you bending forward and backward while standing. These catch movement that a lying-down MRI misses and are the single most important piece of information in deciding whether you need a fusion on top of decompression.

Electrodiagnostic testing

EMG and nerve conduction studies are occasionally helpful when the picture is confusing — especially to rule out peripheral neuropathy from diabetes, which can cause similar symptoms and often coexists.

Types of Lumbar Spinal Stenosis

Not all stenosis is the same. When your surgeon looks at your MRI, they're mapping out three distinct zones where the nerves can get pinched — and the zone affects which operation will actually fix your pain.

Central stenosis

This is narrowing of the main canal, where the bundle of lumbar nerve roots (the cauda equina) runs. Central stenosis most often causes the classic bilateral leg symptoms and neurogenic claudication. It's usually caused by a combination of thickened ligamentum flavum, disc bulging, and enlarged facet joints squeezing the canal from all sides.

Lateral recess stenosis

The lateral recess is a small pocket just off the main canal where an individual nerve root sits before it exits. Lateral recess stenosis typically causes pain down one specific leg in a pattern your surgeon can trace to a single nerve root — more like sciatica than diffuse leg heaviness. It's a common cause of "failed" decompressions when the surgeon only addresses the central canal.

Foraminal stenosis

The neural foramen is the bony doorway where the nerve leaves the spine. Foraminal stenosis squeezes the nerve at that doorway, and it usually causes one-sided leg pain in a clear nerve root pattern. Foraminal narrowing is often missed on axial MRI images and is better seen on sagittal (side-view) cuts. It frequently requires a slightly different surgical approach than central decompression.

In real life, most patients have a combination — central narrowing at one level and foraminal narrowing at another, or a dominant lateral recess on the more painful side. Your surgeon's job is to match the decompression to the exact pattern on your imaging.

How Is It Treated?

Conservative (non-operative) management comes first

If your symptoms are mild or moderate, and you don't have progressive weakness or red flags, conservative care is the right starting point. A reasonable first course usually includes:

• Physical therapy focused on core strengthening and flexion-based exercises (which open the canal)
• Activity modification — using a walker or a cane, pacing long outings, avoiding long periods of standing
• Anti-inflammatory medications and, when appropriate, short courses of neuropathic pain medications
• Epidural steroid injections, which can quiet inflamed nerve roots and buy time for PT to work

Many patients do well with conservative care alone and never need an operation. If the symptoms are tolerable, there is nothing wrong with continuing this approach indefinitely — stenosis is almost never a surgical emergency.

Laminectomy: the standard operation

When symptoms are significant enough to limit daily life and conservative care hasn't worked, surgery is reliable and effective. The standard operation is a lumbar laminectomy — removing the back portion of the bone (the lamina) and the thickened ligamentum flavum at each affected level, which immediately gives the nerves more room. Surgeons also trim the enlarged parts of the facet joints and open the lateral recesses and foramina so each nerve root has a clear path out.

Minimally invasive decompression

Most of our stenosis operations today are done through a minimally invasive approach, sometimes called a microdecompression or a hemilaminotomy. Through a small incision on one side, the surgeon uses a microscope or endoscope to undercut the midline bone and ligament — decompressing both sides of the canal without cutting the muscles off the spine or destabilizing the joints. Patients typically go home the same day or the next morning, with less blood loss, less postoperative pain, and a faster return to walking.

When is fusion added?

Fusion (permanently joining two vertebrae with screws and rods) is not part of a standard stenosis operation. It's added only when there's evidence of instability — most commonly a degenerative spondylolisthesis (one vertebra slipping forward on the next) that moves on flexion-extension X-rays, or scoliosis with significant curve progression.

The evidence on when fusion actually helps is nuanced. The 2016 Ghogawala trial in the New England Journal of Medicine found a small but real quality-of-life benefit from adding fusion for grade 1 spondylolisthesis, while the Swedish Spinal Stenosis Study (Försth et al., same issue) found no benefit at all. The 2021 NORDSTEN-DS trial then showed that decompression alone was non-inferior to decompression with fusion for most patients with grade 1 spondylolisthesis. The practical answer: fusion is the right operation for some patients with instability, but it shouldn't be routine, and a modern decompression can often preserve enough of the joints to avoid it.

What Are the Outcomes?

The best long-term outcome data for lumbar spinal stenosis come from the Spine Patient Outcomes Research Trial (SPORT), a federally funded study that randomized and followed patients at 13 centers for up to 8 years. SPORT is the closest thing spine surgery has to a high-quality controlled trial of surgery vs. non-operative care.

SPORT at 4 years

At the 4-year mark, patients who had surgery for lumbar stenosis reported substantially more improvement in pain, function, and overall quality of life than patients who stayed with non-operative care. The benefit was durable and held up when analyzed across multiple patient subgroups.

SPORT at 8 years

At the 8-year follow-up, the surgical advantage was still there, though it narrowed slightly as some non-operative patients eventually crossed over to surgery and some surgical patients had symptoms return. Around 18% of surgical patients had a second operation by 8 years — either at the same level (for re-stenosis) or at an adjacent segment.

Reoperation — putting the number in context

An 18% reoperation rate sounds high until you remember what it's measuring: an older population with a degenerative disease that keeps progressing in other parts of the spine. Most reoperations aren't "failures" of the original surgery — they're new problems at adjacent levels years later. A careful, level-appropriate decompression at the first operation is still the best way to keep that number as low as possible.

What you should expect

For the right patient — neurogenic claudication limiting walking, imaging that matches the story, conservative care that hasn't worked — a well-done lumbar decompression has a roughly 4-in-5 chance of delivering meaningful, lasting relief. The two most important things you can control are choosing a surgeon who performs this operation routinely and being realistic about what surgery can and cannot fix (it treats leg symptoms better than pure back pain).

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