Spinal Stenosis and Leg Pain

What Is Lumbar Spinal Stenosis?

Lumbar spinal stenosis describes narrowing of the spaces within the lower, or lumbar, spine.

The spinal canal and smaller openings around individual nerve roots provide space for the nerves supplying the legs. If these spaces become sufficiently narrowed, the nerves can become irritated or compressed.

This can cause symptoms in the lower back, buttocks and legs.

Read more: Lumbar Spinal Stenosis: Symptoms and Treatment.

How Does Spinal Stenosis Cause Leg Pain?

The nerves that supply the legs travel through the lumbar spine before leaving the spinal canal.

When the available space becomes narrowed, standing and walking can increase pressure around these nerves in some patients.

This can produce symptoms including:

• pain in one or both legs
• heaviness or aching
• tingling
• numbness
• weakness
• reduced walking tolerance

The symptoms may improve when the pressure on the nerves is reduced by sitting or bending forwards.

What Is Neurogenic Claudication?

Neurogenic claudication is a pattern of leg symptoms caused by lumbar spinal stenosis that typically develops during standing or walking and improves with sitting or bending forwards.

Patients may experience:

• pain in the buttocks or legs
• aching or heaviness
• tingling or pins and needles
• numbness
• weakness or fatigue in the legs
• a progressively shorter comfortable walking distance

Some people find they can walk further when leaning forwards slightly, for example over a shopping trolley.

This characteristic relationship between posture, walking and symptoms can provide an important clue that lumbar spinal stenosis is affecting the nerves.

Why Does Sitting Relieve Leg Pain from Spinal Stenosis?

Sitting normally places the lumbar spine into a more flexed position.

Flexion can increase the available space around the nerves in parts of the lumbar spine. This may reduce nerve compression and allow leg symptoms to settle.

Standing upright or extending the lower back can have the opposite effect in some patients, reducing the available space and provoking symptoms.

This explains why somebody with spinal stenosis may be able to sit comfortably for a considerable time but find standing or walking increasingly difficult.

Why Can Leaning Over a Shopping Trolley Help?

Some patients with neurogenic claudication notice that they can walk further while leaning forwards over a shopping trolley or similar support.

This is because bending forwards flexes the lumbar spine and can increase the space around compressed nerves.

This observation is sometimes referred to informally as the "shopping trolley sign".

It is not sufficient by itself to diagnose spinal stenosis, but it can form part of a characteristic clinical pattern.

Where Is Leg Pain from Spinal Stenosis Felt?

The location varies according to which nerves and areas of the spinal canal are affected.

Symptoms can occur in the:

• buttocks
• thighs
• calves
• shins
• feet

Some patients experience symptoms predominantly in one leg. Others have pain, heaviness or altered sensation affecting both legs.

The symptoms may be diffuse rather than following one precise line down the leg.

Can Spinal Stenosis Cause Heavy Legs?

Yes.

Patients with lumbar spinal stenosis frequently describe their legs as feeling heavy, tired or weak during standing or walking.

The sensation may gradually increase until the person needs to stop, sit down or lean forwards.

After resting, the symptoms may improve sufficiently for walking to resume.

This differs from ordinary muscle tiredness because it is related to the effect of spinal narrowing on the nerves.

Can Spinal Stenosis Cause Numbness or Tingling?

Yes. Compression or irritation of spinal nerves can alter sensation.

Symptoms can include:

• numbness
• pins and needles
• tingling
• burning sensations
• areas of reduced sensation

These symptoms may develop or worsen during walking and improve with rest.

Can Lumbar Spinal Stenosis Cause Weak Legs?

It can.

Patients sometimes use the word "weakness" to describe pain, heaviness or fatigue in the legs during walking. This is not always the same as objective muscle weakness caused by impaired nerve function.

Clinical examination can help distinguish between these possibilities.

New or progressively worsening true muscle weakness should be medically assessed promptly.

Can Spinal Stenosis Cause Sciatica?

Yes.

If narrowing predominantly affects one particular spinal nerve root, symptoms can resemble typical sciatica, with pain extending down one leg together with tingling, numbness or weakness.

However, central spinal stenosis commonly produces a broader pattern of walking-related symptoms affecting one or both legs.

Read more: Sciatica Symptoms: What Does Sciatic Nerve Pain Feel Like?.

What Is the Difference Between Spinal Stenosis and a Slipped Disc?

Both conditions can compress spinal nerves and cause leg symptoms, but the underlying mechanisms are different.

A slipped or prolapsed disc involves disc material protruding and irritating or compressing a nearby nerve. This can occur relatively suddenly and commonly produces sciatica affecting one leg.

Lumbar spinal stenosis more often develops gradually as several structures within the spine change over time and reduce the available space around the nerves.

Stenosis commonly produces symptoms during standing and walking, particularly neurogenic claudication.

The two conditions can also occur together.

Read more: Sciatica from a Slipped Disc.

What Causes Lumbar Spinal Stenosis?

Spinal stenosis commonly develops through a combination of changes affecting the lumbar spine.

These can include:

• changes in the intervertebral discs
• disc bulging
• enlargement or arthritic changes of the facet joints
• thickening of spinal ligaments
• changes in spinal alignment
• spondylolisthesis in some patients

Rather than one structure alone causing the narrowing, several changes may combine to reduce the available space around the nerves.

Is Lumbar Spinal Stenosis Caused by Ageing?

It is commonly associated with age-related changes in the spine and is therefore more frequent in older adults.

However, spinal ageing does not automatically mean that somebody will develop symptoms.

Many people have narrowing visible on MRI without significant leg pain or walking limitation.

Treatment is therefore directed towards the patient's clinical symptoms rather than the appearance of the spine alone.

Can You Have Severe Spinal Stenosis Without Symptoms?

Imaging findings and symptoms do not always correspond directly.

Some people have significant-looking narrowing on MRI with relatively few symptoms, while others experience substantial functional limitation.

This is why describing an MRI as showing "severe stenosis" does not, by itself, determine the need for treatment or surgery.

The scan needs to be interpreted in the context of symptoms, examination and the effect of the condition on everyday function.

How Is Spinal Stenosis Causing Leg Pain Diagnosed?

Assessment begins with the patient's symptom pattern.

A clinician may ask:

• where the leg symptoms occur
• whether one or both legs are affected
• how far the patient can walk before symptoms develop
• whether standing brings on symptoms
• whether sitting relieves them
• whether leaning forwards helps
• whether there is numbness or tingling
• whether there is weakness
• whether lower back pain is also present
• how the symptoms affect normal activities and quality of life

A neurological examination may assess muscle strength, sensation and reflexes.

Other causes of walking-related leg pain may also need to be considered.

Do I Need an MRI for Lumbar Spinal Stenosis?

MRI is commonly used when lumbar spinal stenosis needs to be investigated because it can show the spinal canal, discs, joints and nerves in detail.

The scan can identify:

• where narrowing is occurring
• which spinal levels are involved
• whether individual nerve roots are compressed
• whether a disc prolapse is also present
• other structural features that may influence treatment

However, imaging is most useful when the findings are interpreted alongside the symptoms and examination.

Can Leg Pain from Spinal Stenosis Be Confused with Circulation Problems?

Yes.

Both spinal stenosis and reduced blood supply to the legs can cause symptoms during walking that improve with rest.

The mechanisms are different. Neurogenic claudication originates from spinal nerve compression, while vascular claudication results from impaired blood flow to the leg muscles.

The symptom pattern can sometimes help distinguish the two, but assessment may be required when the diagnosis is uncertain.

This is particularly important because not every walking-related calf or leg pain originates from the spine.

Can Spinal Stenosis Be Treated Without Surgery?

Yes. Many people manage lumbar spinal stenosis without an operation.

Depending upon symptoms and individual circumstances, non-surgical management may include:

• remaining appropriately active
• exercise
• physiotherapy or rehabilitation
• appropriate pain management
• modification of activities where necessary
• management of general health and mobility

The objective is to preserve function and maintain activity where possible while monitoring the effect of symptoms on mobility and quality of life.

Are Epidural Injections Recommended for Neurogenic Claudication?

NICE guidance advises against using epidural injections for neurogenic claudication caused by central spinal canal stenosis.

This is an important distinction from acute and severe sciatica, where an epidural injection containing local anaesthetic and steroid may be considered in selected patients.

The appropriate treatment therefore depends upon the specific cause and pattern of the leg symptoms rather than simply whether somebody has pain radiating into the leg.

When Might Surgery Be Considered for Spinal Stenosis?

Surgery may be considered when nerve compression causes significant persistent symptoms and substantially limits walking, mobility or quality of life despite appropriate non-surgical management.

A specialist may consider:

• the severity of the leg symptoms
• walking and standing tolerance
• numbness or weakness
• the effect on everyday activities
• response to previous treatment
• clinical examination findings
• the location and severity of narrowing on imaging
• the patient's general health
• the likely benefits and risks of surgery

An MRI showing spinal stenosis does not automatically mean an operation is required.

What Is Lumbar Decompression Surgery?

Lumbar decompression surgery aims to create more space around compressed spinal nerves.

Depending upon the anatomy involved, surgery may include removal of part of the bone or ligament contributing to the narrowing.

Procedures can include a laminotomy or laminectomy, with the exact operation tailored to the area and extent of nerve compression.

The objective is principally to relieve the nerve-related symptoms caused by spinal stenosis.

Does Decompression Always Require Spinal Fusion?

No.

Many lumbar decompression operations can be performed without fusion.

Fusion or another form of stabilisation may be considered in selected patients where there is an additional problem such as significant instability or deformity.

The need for fusion is therefore assessed separately rather than being an automatic part of treatment for lumbar spinal stenosis.

Can Surgery Improve Walking Distance?

In appropriately selected patients, decompression surgery aims to relieve pressure on the nerves responsible for neurogenic claudication.

The intended benefits can include improvement in:

• leg pain
• walking tolerance
• standing tolerance
• nerve-related leg symptoms
• everyday function

The likely benefit varies between patients and should be discussed individually before an operation.

Accompanying lower back pain may have several causes and can respond differently from the leg symptoms.

When Should I See a Spine Specialist?

Specialist assessment may be appropriate when:

• walking distance is becoming substantially restricted
• leg pain or heaviness persists
• symptoms significantly affect everyday activities
• there is persistent numbness or tingling
• weakness develops
• the diagnosis is uncertain
• an MRI or further treatment is being considered

Assessment can help establish whether spinal stenosis is actually responsible for the symptoms and whether continued non-surgical management or further treatment may be appropriate.

When Do Leg Symptoms from Spinal Stenosis Require Urgent Assessment?

Most lumbar spinal stenosis develops gradually and does not require emergency treatment.

However, significant neurological deterioration requires prompt assessment.

Seek urgent or emergency medical help if back or leg symptoms are associated with:

• severe or rapidly worsening weakness or numbness affecting both legs
• loss of sensation around the genitals or anus
• new difficulty controlling or passing urine
• inability to urinate
• new loss of bowel control

These symptoms can indicate severe compression of the nerves at the bottom of the spinal canal, including cauda equina syndrome.

Rapidly changing neurological symptoms should not be left to await a routine outpatient appointment.

Frequently Asked Questions About Spinal Stenosis and Leg Pain

What does leg pain from spinal stenosis feel like?

It may feel like pain, aching, heaviness, burning, tingling or numbness in one or both legs. Symptoms commonly become worse during standing or walking and improve when sitting or leaning forwards.

Why do my legs hurt when I walk but improve when I sit down?

This can occur with neurogenic claudication from lumbar spinal stenosis. Standing and walking can reduce the available space around affected spinal nerves, while sitting or bending forwards can increase that space and relieve symptoms. Other conditions can produce similar symptoms, so assessment may be required.

Can spinal stenosis make my legs feel heavy?

Yes. Heaviness, aching or fatigue in the legs during walking is a common description among patients with neurogenic claudication.

Can spinal stenosis cause numb feet?

Yes. Compression of lumbar spinal nerves can cause tingling, numbness or altered sensation extending into the lower legs and feet.

Can spinal stenosis cause sciatica?

Yes. If narrowing affects an individual nerve root, spinal stenosis can cause sciatic-type pain extending down one leg. Central stenosis may instead cause broader symptoms affecting one or both legs during walking.

Does spinal stenosis always get worse?

Not necessarily. The clinical course varies considerably. Some people manage symptoms successfully for long periods without surgery, while others develop increasing limitations that warrant specialist assessment.

Does severe spinal stenosis on an MRI mean I need surgery?

No. Treatment is based upon the patient's symptoms, neurological findings, functional limitation and imaging together. Significant narrowing can sometimes be present without severe symptoms.

When is surgery considered for spinal stenosis?

Surgery may be considered when significant nerve-related leg symptoms or walking limitation persist despite appropriate non-surgical management and imaging demonstrates corresponding nerve compression.

About This Article

This article provides general information about leg pain and neurogenic claudication associated with lumbar spinal stenosis. It is not intended to diagnose an individual's symptoms or replace personalised medical advice.

Medically reviewed by Professor Nasir A. Quraishi
Consultant Spinal Surgeon & Honorary Professor

Clinical sources: NICE guidance on low back pain and sciatica in people aged 16 and over, NICE information on neurogenic claudication associated with lumbar spinal stenosis, and NHS information about lumbar spinal stenosis and lumbar decompression surgery.

Further Information About Leg Pain

If leg pain, heaviness, numbness or weakness develops during standing or walking, specialist assessment can help determine whether lumbar spinal stenosis is responsible and whether further investigation or treatment may be appropriate.

Learn more about Leg Pain / Sciatica

What Causes Sciatica?
Sciatica Symptoms: What Does Sciatic Nerve Pain Feel Like?
MRI Scans for Sciatica: When Are They Needed?
Sciatica from a Slipped Disc
When Does Sciatica Need Surgery?