Musculoskeletal · PANCE / PANRE

Lumbar Spinal Stenosis

Degenerative narrowing of the lumbar canal in older adults causing neurogenic claudication relieved by spinal flexion.

Also known as: LSS, spinal stenosis, lumbar stenosis, neurogenic claudication

Overview

Narrowing of the lumbar central canal, lateral recess, or neural foramina producing compression of the cauda equina or exiting nerve roots. Most commonly degenerative in older adults; congenitally narrow canals predispose to symptomatic presentation at lower thresholds.

Epidemiology

Most common cause of lumbar spine surgery in adults over 65. Prevalence rises with age; symptomatic LSS in ~10% of adults over 60.

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Risk factors

Age >60
Degenerative disc and facet disease
Spondylolisthesis (degenerative)
Congenital short pedicles (early presentation)
Paget disease
Ankylosing spondylitis (ossified ligaments)
Acromegaly

Pathophysiology

Combination of disc bulging, facet hypertrophy, ligamentum flavum thickening, and osteophyte formation narrows the canal and neural foramina. Standing and lumbar extension further reduce canal diameter, compressing neural elements and causing symptoms. Flexion (sitting, leaning forward) increases canal area and relieves symptoms.

Clinical presentation

Symptoms

Bilateral or unilateral leg pain, numbness, or weakness with walking or standing
Symptoms relieved by sitting, leaning forward, or flexing the spine ('shopping cart sign')
Better walking uphill or pushing a cart (flexed posture); worse walking downhill or standing erect
Back pain often less prominent than leg symptoms
Symptoms progress over months to years

Signs / physical exam

Often unremarkable when supine — examination after walking can reproduce symptoms
Wide-based gait, reduced lumbar extension
Mild distal weakness or hyporeflexia may be present
Pulses preserved (helps differentiate from vascular claudication)
Romberg testing may be positive in advanced disease

Differential diagnosis

Vascular claudication (PAD) — Pain calf > thigh, relieved by standing still (not posture change), reduced pulses, ABI <0.9
Hip osteoarthritis — Groin pain reproduced by hip motion, FABER positive
Diabetic peripheral neuropathy — Symmetric stocking distribution, sensory loss, normal back exam
Acute lumbar radiculopathy / disc herniation — Younger patients, sharper dermatomal pain, positive SLR
Trochanteric bursitis — Lateral hip tenderness on palpation
Cauda equina syndrome — Acute onset, saddle anesthesia, urinary retention — emergency
Pseudoclaudication from venous disease — Edema, varicosities, heaviness improved by elevation

Diagnostic workup

Labs

Generally not needed
ABI if vascular claudication suspected

Imaging

MRI lumbar spine — diagnostic test of choice; demonstrates canal and foraminal narrowing
CT myelogram — alternative if MRI contraindicated
Plain radiographs — flexion-extension views to detect dynamic spondylolisthesis

Diagnostic algorithm

Feature	Neurogenic claudication (LSS)	Vascular claudication (PAD)
Trigger	Walking, standing erect	Walking; consistent distance
Relief	Sitting, leaning forward, flexion	Standing still
Position effect	Flexion relieves, extension worsens	Posture independent
Uphill / downhill	Uphill BETTER (flexed)	Uphill WORSE
Pulses	Preserved	Diminished or absent
ABI	Normal	<0.9
Imaging	MRI lumbar stenosis	ABI, arterial duplex, angiogram

Neurogenic vs vascular claudication — the bedside discriminators.

Treatment

First-line

Patient education and reassurance — natural history often stable or slowly progressive
Activity modification — flexion-based exercises (stationary bike, recumbent exercise)
Physical therapy — flexion-strengthening (Williams exercises), core stabilization
NSAIDs — ibuprofen, naproxen, meloxicam — first-line pharmacotherapy
Acetaminophen as adjunct
Gabapentin or pregabalin for neuropathic features

Second-line / adjunct

Epidural steroid injections — modest short-term benefit; can be considered for radicular pain
Avoid chronic opioids
Surgical decompression (laminectomy) — for patients with persistent disabling symptoms despite conservative care; greater short-to-medium-term benefit than non-operative care in selected patients
Fusion added when associated spondylolisthesis or significant instability

Complications

Progressive functional decline, falls, deconditioning
Cauda equina syndrome (rare; acute decompensation)
Postoperative complications: dural tear, infection, persistent pain, instability requiring fusion

PANCE pearls

The 'shopping cart sign' — relief while leaning forward over a cart — is one of the most useful historical clues.
Walking distance is preserved or even better with hills/uphill (flexion); reduced with downhill walking (extension).
Preserved peripheral pulses help differentiate neurogenic from vascular claudication; check ABI when in doubt.
Conservative management is reasonable indefinitely if symptoms are tolerable — decompression is for refractory disabling disease.
Always reassess for cauda equina warning signs in any patient with known stenosis.

References

NASS 2011/2013 — NASS Evidence-Based Clinical Guidelines: Diagnosis and Treatment of Degenerative Lumbar Spinal Stenosis (Kreiner et al., Spine J 2013)
AAOS Appropriate Use — AAOS Appropriate Use Criteria — Spinal Surgery for Lumbar Spinal Stenosis (2019)
SPORT Trial — Surgical vs Non-operative Treatment for Lumbar Spinal Stenosis (Weinstein et al., NEJM 2008)

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