Spinal Stenosis

The shopping cart sign

Patients with lumbar spinal stenosis often describe the same thing without prompting. Walking any distance brings on aching, heaviness, or burning in the legs. Stopping helps, but what helps faster is sitting down or leaning forward. Pushing a shopping cart through a grocery store is comfortable. Walking the same distance upright is not. Going uphill is easier than going downhill. Riding a bicycle, bent forward, may be nearly symptom-free.

This is not a coincidence, and it is a more useful diagnostic clue than most imaging.

What is actually happening

Spinal stenosis means narrowing of the space available for the neural structures — either the central canal, where the spinal cord or cauda equina sits, or the foramen, where individual nerve roots exit.

The narrowing usually develops slowly with age, from a combination of disc height loss, thickening of the ligamentum flavum, and enlargement of the facet joints as they take on more load.

The reason position matters so much is mechanical. Extending the spine — standing tall, walking, leaning back — buckles the ligamentum flavum inward and narrows the canal further. Flexing forward opens it. Your body has already figured this out, which is why you are leaning on the cart.

The resulting symptom pattern is called neurogenic claudication: leg symptoms brought on by walking and relieved by positional change.

Stenosis of the neck is a different concern

Cervical stenosis can compress the spinal cord itself, producing a condition called myelopathy. This presents differently and warrants more urgency.

Watch for clumsiness of the hands, difficulty with buttons or handwriting, a change in balance or gait, a feeling of heaviness in the legs, or electric sensations down the spine with neck flexion. These are cord signs, not nerve root signs, and they need prompt evaluation.

What the scan does and does not settle

Imaging in stenosis has the same trap as everywhere else in the spine: narrowing is extremely common in older adults who have no symptoms whatsoever. A radiology report describing moderate or even severe stenosis in a person who walks two miles comfortably is a description of an aging spine, not an explanation of pain.

The correlation between the degree of narrowing on MRI and the severity of a patient's symptoms is genuinely poor. What matters clinically is the symptom pattern, the exam, and your walking tolerance — how far you can go before the legs start, and what it takes to reset them.

I use imaging to confirm what the history already suggests and to plan an intervention, not to make the diagnosis in the first place.

The part patients find surprising

Stenosis is a structural narrowing, and it is tempting to conclude that only a structural fix can help. In practice, many people with stenosis substantially improve their walking tolerance without any procedure at all.

The reason is that the canal is not the only variable. How much your spine extends while you walk, how well your hips extend, whether your abdominal and gluteal muscles are contributing, how stiff your thoracic spine is — all of these change the position your lumbar spine sits in during gait. Shift those, and you change how much room the nerves have at the moment they need it.

This is why two people with identical scans can have completely different function.

How we approach it

Manual treatment to improve mobility where it has been lost, particularly at the hips and thoracic spine. If your hips do not extend, your lower back extends instead, and that is exactly the position that closes the canal.

Flexion-biased strengthening and conditioning. Building the muscles that let you hold a slightly less extended posture during walking, and building general capacity so that walking is less taxing overall. Stationary cycling and inclined treadmill walking are often well tolerated and let people train without provoking symptoms.

Progressive walking programs structured around your actual tolerance, using positional resets rather than pushing through.

Ultrasound-guided injections for symptom control when pain limits participation in the above. Epidural steroid injections can provide a window of relief, and how long it lasts varies considerably.

Electrodiagnostic testing when the picture is muddied by neuropathy, which is common in this age group, or when we need to know how much of the leg symptoms are truly neurogenic.

When surgery is worth discussing

Decompression surgery for lumbar stenosis has a reasonable track record for the right patient, and I have no philosophical objection to it. It becomes worth discussing when:

• Walking tolerance is severely limited despite genuine effort at conservative care
• There is progressive neurologic deficit
• Cervical myelopathy is present, where the calculus shifts toward earlier intervention
• Quality of life is meaningfully constrained and you have decided the tradeoff is worth it

The honest framing is that decompression tends to be better than conservative care for leg symptoms and walking distance in well-selected patients, and less reliable for back pain itself. If your main complaint is back pain rather than leg symptoms with walking, be cautious about expecting surgery to solve it.

When to come in

Come in if walking distance is shrinking, if you are avoiding activities to stay ahead of the symptoms, or if you have been told you have stenosis and want to know what can actually be done short of surgery.

Come in promptly for hand clumsiness, gait change, new balance problems, or any bowel or bladder change.