Lumbar spinal stenosis in older adults: leg pain on walking, exercise and surgery

NHS inform describes spinal stenosis as narrowing of the tunnels in the spine that contain the nerves or spinal cord, most common in the lower back (lumbar) and neck (cervical). Most narrowing is a normal part of ageing and often does not cause problems. South Tees explains that by the time the spinal cord reaches the lower back it sends out nerve roots into the lumbar tunnel and down to the legs; with age the tunnel narrows in most people and for some this crowds and irritates the nerve roots.

South Tees says lumbar stenosis affects about 11% of the general population, is very uncommon under 50, and has an average age of 62 to 69. NHS inform adds that nerves can learn to adapt to the narrowed space and that the majority of people can manage symptoms well with the right advice.

South Tees lists aching or cramping pain in the lower back, buttocks, thighs or calves, heaviness or weakness in the legs when walking, night-time leg cramps, and pins and needles. NHS inform adds pain, numbness and tingling in the legs, usually worse with walking or standing and relieved by sitting or leaning forward. South Tees explains why: the spine is flexed in those positions and the tunnel gets bigger.

NHS inform notes that, without leg or arm symptoms, low back or neck pain is usually not thought to be caused by stenosis. Cervical stenosis affects the arms and hands with pain, stiffness, weakness, tingling or numbness, and sometimes headaches.

South Tees says not all leg pain is due to stenosis. Pain-sensitive muscles and joints of the back, hip and pelvis can cause leg pain, and peripheral artery disease, where blood supply to the legs is restricted, can give similar symptoms. The distinction is practical: in artery disease, walking brings on calf pain that eases when you stand still, whereas in lumbar stenosis it typically eases on sitting or bending forward. The NHS describes peripheral arterial disease pain as easing within a few minutes of rest. A clinician can tell the difference using history, examination and, if needed, ankle and arm blood pressure checks.

South Tees says scans are not usually required to diagnose lumbar stenosis, as it is a clinical diagnosis based on history, symptoms and physical examination. Scans may be needed for surgical planning in people with severely limiting symptoms, or when a serious medical disorder is suspected. NHS inform says that for people with severe and worsening symptoms, scans may be considered to help decide if spinal surgery may be helpful. Narrowing on a scan alone does not prove it is the cause of pain, since so many older people have it.

South Tees says the two treatment options are exercise therapy and surgical decompression, with current guidelines recommending an initial 12 weeks of progressive exercise therapy with or without a physiotherapist. The purpose is not to change the narrowing but to reduce nerve irritation and improve nerve resilience; exercise may also help function, muscle strength and balance in later life. Examples include a progressive cycling programme, an adjusted walking programme and stretching, with swimming for those whose pain is intense. NHS inform lists physiotherapy (referral or self-referral in some areas), staying active, pacing, healthy weight, stopping smoking, managing stress, pain management and medication.

It adds that if leg symptoms ease with bending forward, regular breaks when walking, sitting or leaning against a wall can help, and that a walking aid may be useful. Advice on lifestyle, weight loss and medicines review may help but South Tees says there is currently insufficient evidence for strong recommendations. For older people, a medicines review is also a chance to check sedating or dizziness-causing tablets that raise falls risk.

South Tees describes surgical decompression (laminectomy, removing a small part of the tunnel wall) as something that may be considered if symptoms are severe, with progressive neurological decline, or after a period of exercise therapy. It says there is currently no definitive evidence that laminectomy improves symptoms, that some people improve while others do not, and that injections are not usually recommended. NHS inform lists spinal injections, spinal surgery and specialist pain services as options if other treatments have been tried. Any operation is discussed with the surgeon alongside the person's general health and risks.

NHS inform says spinal stenosis can occasionally lead to cauda equina syndrome or cervical myelopathy, rare but serious conditions that can cause permanent damage or disability, and that early recognition and treatment can prevent deterioration. It advises contacting the GP practice urgently for new onset or significant worsening of bladder or bowel changes (urgency, frequency, difficulty passing urine, leaking or incontinence), changed sensation around the bottom or genitals or sexual dysfunction, reduced balance or difficulty walking, pain, weakness, heaviness or changing sensation in the arms or legs, clumsy hands such as dropping things or struggling with buttons, or neck pain with a severe headache. If the practice is closed, phone 111.

The NHS back pain page says to call 999 or go to A&E for back pain with pain, tingling, weakness or numbness in both legs, loss of feeling around the genitals or anus, or bladder or bowel changes.