Lumbar spinal stenosis: evidence-based nonsurgical treatments

Lumbar spinal stenosis — a narrowing of the spinal canal in the lower back — is one of the most common reasons people over 60 seek medical care. The lumbar spine contains a canal through which the spinal cord and the nerve roots that travel to the legs pass. With aging, that canal gradually narrows through a combination of factors: facet joint arthritis, thickening of the ligamentum flavum, disc bulges, degenerative spondylolisthesis. When the narrowing becomes significant, it compresses the nerve roots and symptoms appear.

In the office, lumbar spinal stenosis tells a very typical story: a patient over 60 who tells me they can no longer walk more than a block without having to sit down, that at the supermarket they lean on the cart because bending forward brings relief, and that on a stationary bike nothing bothers them at all. That description, called neurogenic claudication, is worth more than any MRI. When I hear it clearly, I know where we're headed before I even look at the images. And when it's absent, that's information too: very often what we see on the MRI is not what's causing the pain.

How it presents clinically

The typical picture is called neurogenic claudication and has very recognizable features:

• Leg pain when walking: after a certain number of blocks — which varies with severity — pain, heaviness, tingling or cramps appear in one or both legs. The patient needs to stop.
• Relief when sitting down or bending forward: this is the key to the diagnosis. Patients describe feeling better while seated, when walking while pushing a supermarket cart (which lets them lean forward), or when riding a bicycle (also a flexed position).
• Low back pain: may or may not be present. Some patients report leg pain only.
• Worsening when standing or walking downhill: both situations extend the spine and aggravate the symptoms.

One important nuance: lumbar spinal stenosis shows up on a very high proportion of MRIs in older adults, and many of those people have no symptoms at all. The image alone doesn't decide anything. What decides is the correlation between what the patient describes, what the physical exam shows and what the MRI reveals. When all three line up, the diagnosis is solid and the plan is clear. When they don't, treating the stenosis on the image without it being the real source of the pain leads to procedures and surgeries that won't make the patient better.

Why it matters to distinguish it from other causes

Leg pain when walking can have other causes, and it's worth telling them apart because they call for completely different treatment:

• Vascular claudication: the pain also appears with walking, but it improves with rest in any position (not specifically with sitting or bending forward). The cause is vascular and requires a cardiovascular workup.
• Hip or knee joint disease: joint pain has different features — it typically worsens with movement of the joint rather than with posture.
• Peripheral neuropathy: causes tingling and numbness that do not depend on walking.

A good physical exam and a detailed history already point a long way toward the answer. An MRI confirms the diagnosis and shows the degree of narrowing.

Available treatments

Initial conservative treatment

This includes pain control with analgesics and anti-inflammatories for limited periods (not for chronic use), medication for neuropathic pain if there is radiating pain with tingling, and habit changes: avoiding prolonged standing, wearing comfortable footwear, maintaining a healthy weight.

Targeted physical therapy

Physical therapy for spinal stenosis is quite specific. It works on:

• Flexion-based postures that decompress the canal.
• Strengthening the core and abdominal muscles.
• Stretching the posterior chain.
• Aerobic conditioning on a stationary bike (which is very well tolerated).

Lumbar epidural injections

Epidural steroid injections are one of the pillars of nonsurgical treatment for spinal stenosis. Current evidence shows they can significantly relieve symptoms in many patients, improving walking distance and quality of life. The effect can last for months, and the injections can be repeated when it wears off.

The procedure is performed under fluoroscopic guidance, is done on an outpatient basis, takes about 30 minutes, and the patient goes home the same day.

Other interventional options

In selected cases, techniques such as the following are used:

• Epidural adhesiolysis: when there are associated epidural adhesions or fibrosis.
• Percutaneous decompression procedures: minimally invasive techniques that reduce the bulk of the ligamentum flavum.

Surgery

Decompressive surgery (laminectomy or its variants) is indicated when conservative treatments fail to control the symptoms and the functional limitation is significant. Also when there is progressive neurological deterioration. The decision is individual and depends on the degree of discomfort, age, coexisting conditions and the response to previous treatment.

My approach to symptomatic lumbar spinal stenosis is stepwise. First, serious conservative management: physical therapy focused on flexibility and core strengthening, medication adjustment, control of coexisting conditions. If the radicular pain and claudication persist and limit daily life, I consider epidural injections, which in well-selected patients offer windows of relief that make rehabilitation possible. Decompressive surgery is reserved for cases with progressive neurological deficit, uncontrollable pain or severe functional loss that responds to none of the above. Operating "because the MRI looks bad" is not a good reason.

A realistic outlook

Lumbar spinal stenosis is a degenerative condition: it is not "cured" in the strict sense, because the anatomical changes are there to stay. But it can be controlled very well, and most patients manage to maintain a good quality of life for years by combining several resources: medication as needed, sustained physical therapy, periodic epidural injections when required, and lifestyle adjustments.

The goal of treatment is not to make the MRI image disappear, but to increase the distance you can walk and improve your quality of life. Those are the outcomes that matter.

If you notice that you can walk less and less before having to stop, that you avoid going out for fear of the pain, or that you have already taken plenty of anti-inflammatories without results, a dedicated consultation is worthwhile.

When a patient with spinal stenosis comes back and tells me they've been able to take long walks again, go to the supermarket without having to sit down, or sleep through the night, I know the success wasn't down to a single move but to a well-built strategy. In this condition, what sustains the results is the combination of pain treatment, well-directed exercise and the patience not to rush the steps. My role is to guide that process, offer the tools in the right order and reserve surgery for the cases where it truly changes the prognosis. Managed well, spinal stenosis can be lived with very differently from what patients fear when they first walk in.

Dr. Mauricio Casarsa

Anesthesiologist, specialist in Pain Medicine and Interventional Pain Management. Postgraduate training at UBA (Fundación Dolor) and UNLP (CAIDBA). Staff physician at Hospital Alemán de Buenos Aires.

MN 137756 · San Isidro · Villa Urquiza