What is spinal stenosis?
Spinal stenosis is a narrowing of the canal that carries the spinal nerves, most often in the lumbar spine and usually caused by age-related changes: thickened ligaments, bulging discs and enlarged facet joints gradually reduce the space available. The classic result is neurogenic claudication — aching, heaviness, numbness or weakness in the legs that comes on with walking or standing and eases within minutes of sitting or leaning forwards, for example on a supermarket trolley. It mainly affects people over 60 and tends to progress slowly.
Diagnosis combines the characteristic story with examination, and MRI confirms the narrowing and shows which levels are affected. Assessment also distinguishes stenosis from vascular claudication caused by poor circulation, which can feel similar but behaves differently.
Common symptoms
- Aching, heavy or tired legs on walking or standing
- Symptoms eased by sitting or leaning forwards
- Numbness or tingling in the legs or feet
- Reduced walking distance over time
- Balance feeling less secure
- Lower back pain and stiffness
- Leg weakness in more advanced cases
How long will you wait?
Routine NHS referral for spinal stenosis, through triage, MRI and on to decompression surgery for those who need it, commonly takes six months or more at many trusts, with spinal surgery lists under similar pressure to the rest of orthopaedics.
Privately, you can typically see a spinal surgeon within 3–7 days, with MRI within days and decompression surgery, if appropriate, usually scheduled within 2–6 weeks.
NHS England median referral-to-treatment wait: 12.4 weeks, with 2.5 million people waiting over 18 weeks (May 2026). Individual waits vary by trust and urgency.
Treatment options
- Physiotherapy and exercise. Flexion-based exercise, cycling and strength work maintain mobility and can meaningfully extend walking distance.
- Pain relief and injections. Medication and epidural steroid injections can ease symptoms, though injection benefit is often temporary.
- Lumbar decompression surgery. Removing the bone and ligament compressing the nerves is effective at relieving leg symptoms in well-selected patients.
- Decompression with fusion. When stenosis is accompanied by slippage between vertebrae, the decompressed level may also be stabilised with a fusion.
What does private treatment cost?
As a guide, self-pay lumbar decompression typically costs around £9,000–£13,000, rising if fusion is also required.
Does health insurance cover spinal stenosis?
Private medical insurance typically covers the investigation of spinal stenosis and decompression surgery where it arises after the policy began. Because stenosis develops gradually with age-related change, insurers may scrutinise whether symptoms or related back problems pre-dated the policy, in which case exclusions can apply. As a slowly progressive condition it may be handled under chronic condition rules, with defined treatments covered rather than open-ended management.
Frequently asked questions
Will spinal stenosis get worse if I don't have surgery?
Not necessarily. Studies following people with stenosis show that many remain stable for years, some improve, and only a proportion deteriorate. This is why watchful waiting with exercise and symptom control is a legitimate strategy for milder cases. Progressive weakness, falls or rapidly shrinking walking distance shift the balance towards surgery.
Why do my legs feel better when I lean forwards?
Bending forwards slightly increases the space in the spinal canal, easing pressure on the nerves, while standing upright and walking narrow it further. This is why people with stenosis often walk comfortably behind a shopping trolley, manage cycling well, and instinctively sit down to recover. It is a hallmark of the condition and helps distinguish it from circulation problems.
How successful is decompression surgery?
For leg symptoms in well-selected patients, results are good: most people gain significant relief of leg pain and improved walking distance, with a high satisfaction rate. Back pain itself improves less predictably, and this is factored into the decision. Age alone is not a barrier; surgery is regularly performed successfully in patients well into their eighties.