You set off on your usual walk and, a few hundred metres in, your legs start to feel heavy. Then achy, or numb, or weak, until you have to stop. You sit on a bench for a couple of minutes and it fades, and off you go again. And you have noticed something odd: at the shops, pushing a trolley, you can walk for ages. If that is your story, it has a name, and the scan you may already have had is probably less alarming than it sounds.
Lumbar spinal stenosis is one of the most common reasons people over 60 cut their walks short, and one of the most misunderstood. This article explains what it is, why the MRI finding is so much more common than the symptoms, and what a landmark trial found when it compared physiotherapy with surgery.
In this article
What is lumbar spinal stenosis?
Stenosis simply means narrowing. In the lower back, the nerves to the legs run through a canal formed by the bones of the spine. With age, the discs flatten, the small joints at the back of the spine enlarge and the ligaments thicken, and the canal gets narrower. When it narrows enough to crowd the nerves, standing upright and walking (which narrow the canal a little further) can bring on heaviness, aching, numbness, tingling or weakness in the buttocks and legs. Sitting or bending forward (which open the canal) relieves it, usually within minutes.
That pattern, leg symptoms that come on with walking and go away with rest or flexion, is called neurogenic claudication, and it is the defining feature. Many people with stenosis have surprisingly little back pain. It is the legs that tell the story.
If your walks have been getting shorter, our physiotherapy in Mount Gravatt team can assess whether this is the pattern and build a plan around it.
Why is the scan finding so common when the symptoms are not?
The scan is not the symptoms
In the same study, 77.9% of participants had at least moderate narrowing of the canal on MRI, yet only 17.5% of those with severe narrowing actually had symptoms. Narrowing on a scan is a normal part of ageing for most people; the condition is what your legs do when you walk.
This is the single most useful thing to understand if you have been handed a report that says "moderate" or "severe" stenosis. Most people over 60 have narrowing on a scan. Most of them have no symptoms from it. The report describes the shape of your spine, not your future, and it certainly does not tell you whether you need an operation. What matters is how far you can walk, what stops you, and what brings you back.
Got a scan report and a lot of questions? A spine assessment at ACE Sports Medicine in Upper Mount Gravatt puts the report next to what your legs are actually doing.
Why can you walk further pushing a trolley?
Because leaning forward opens the canal. Bending the lower back forward, even slightly, increases the space around the nerves, and pushing a trolley, leaning on a walking frame, or walking uphill all put the spine in that position. Walking upright, walking downhill and standing still in a queue do the opposite. People with stenosis often work this out for themselves long before anyone names it: they are the ones who lean on the bench at the bus stop, ride an exercise bike comfortably but cannot walk on a treadmill, and can garden on their knees for hours but not stand at the sink.
This is not a trick to avoid; it is information. It tells the physiotherapist that flexion helps you, and that becomes the foundation of the programme.
Physiotherapy or surgery: what did the trial find?
In a randomised trial published in the Annals of Internal Medicine, 169 people with lumbar spinal stenosis who had all been assessed as surgical candidates were allocated either to decompression surgery or to a structured physiotherapy programme. At two years, the two groups had the same improvement in physical function. In other words, in people who were all eligible for an operation, a proper conservative programme matched the surgery on the outcome that mattered most.
That does not mean surgery is never the right choice. Some people do not get enough relief from conservative care, and a Cochrane review notes that between 5% and 18% of people in the surgical arms of comparison trials experienced adverse events, some serious, which is part of why a genuine trial of conservative care comes first. The decision is yours, made with your doctor, and it is much better made after you have tried a programme built for the condition than before.
What actually helps?
A stenosis programme looks different from a general back programme. It is built around flexion and around your symptom threshold. That means walking and cycling in doses that stop short of the point where your legs give out, then building the distance gradually; exercises that strengthen the hips, buttocks and trunk so the spine is better supported; movements that bias the lower back into gentle flexion; manual therapy where it helps you move; and practical strategies you can use today, like the trolley lean, a walking pole, a seat plan for longer outings, and knowing that the exercise bike is your friend.
Many people with stenosis improve their walking distance meaningfully with this kind of structured, supervised programme. For the walking and strength side, our exercise physiology in Mount Gravatt service and the Better Bones and Balance programme are a natural fit for the over-60s who want to keep moving.
When should you seek help?
Walks that are getting shorter, or legs that are the reason you stop, are worth assessing early, because walking capacity is easier to keep than to rebuild.
Consider getting assessed if
Your legs go heavy, achy, numb, tingly or weak after walking or standing and settle when you sit or lean forward; you can walk further pushing a trolley than walking upright; your walking distance has shrunk over months; or a scan has reported stenosis and you are unsure what to do with it. Seek urgent medical care for any new change in bowel or bladder control, numbness in the saddle area, rapidly worsening leg weakness, or fever or unexplained weight loss with back pain.
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Helping You Perform at Your Best
Our physiotherapy and exercise physiology team at ACE Sports Medicine in Upper Mount Gravatt works with people across Brisbane's southside who want to keep walking, keep gardening and keep their independence. Spinal stenosis is common, the scan is usually scarier than the condition, and a programme built for it can make a real difference.