What Is Spinal Stenosis?
Spinal stenosis is the progressive narrowing of the vertebral canal, the lateral recesses, or the intervertebral foramina, resulting in compression of neural structures — spinal cord, cauda equina, or nerve roots. It is one of the most common causes of low back and neck pain in adults over 50.
Although the term "stenosis" simply means narrowing, the clinical picture depends not only on the degree of canal reduction but on the presence of effective neural compression. Patients with narrow canals may be asymptomatic, while others with moderate narrowing have intense symptoms.
Stenosis can affect the cervical, thoracic, or lumbar spine. The two clinically relevant forms are lumbar stenosis — a cause of neurogenic claudication — and cervical stenosis — which can lead to spondylotic cervical myelopathy, a potentially serious condition.
Degenerative
The most frequent cause is progressive joint degeneration: facet hypertrophy, disc protrusion, and ligament thickening.
Neurogenic Claudication
In lumbar stenosis, the cardinal symptom is leg pain when walking, relieved by sitting or trunk flexion.
Cervical Myelopathy
In cervical stenosis, cord compression can cause gait disturbance, hand weakness, and upper motor neuron signs.
Epidemiology
Lumbar spinal stenosis is the most common surgical indication in patients over 65. Prevalence increases significantly with age, paralleling degeneration of the intervertebral discs and facet joints.
Imaging studies in asymptomatic populations show that lumbar canal narrowing is present in 20-30% of individuals over 60, reinforcing that an isolated radiologic finding does not define the disease. Clinical-radiologic correlation is essential for proper diagnosis.
In the cervical spine, spondylotic myelopathy is the most common cause of cord dysfunction in adults over 55. Risk factors include a constitutionally narrow vertebral canal (anteroposterior diameter less than 13 mm), advanced spondylosis, and a history of cervical trauma.
Pathophysiology
Degenerative spinal stenosis results from progressive changes in three components of the vertebral segment: the intervertebral disc, the facet joints, and the ligaments. The degenerative cascade begins with disc dehydration and loss of disc height, which redistributes loads to the facets and ligaments.
Under overload, the facet joints become hypertrophic with osteophyte formation that invades the central canal and lateral recesses. The ligamentum flavum, normally elastic, becomes thickened and inelastic, further reducing the space available for neural structures.
Types of Stenosis
ANATOMIC CLASSIFICATION OF SPINAL STENOSIS
| TYPE | LOCATION | COMPRESSED STRUCTURES | CLINICAL PICTURE |
|---|---|---|---|
| Central | Central vertebral canal | Cauda equina (lumbar) or cord (cervical) | Neurogenic claudication or myelopathy |
| Foraminal | Intervertebral foramen | Transiting nerve root | Unilateral radiculopathy |
| Lateral recess | Lateral recess of the canal | Emerging nerve root | Positional radiculopathy |
| Combined | Multiple locations | Mixed | Mixed radicular and claudicant picture |
Symptoms
The clinical presentation of spinal stenosis varies by location (cervical or lumbar) and type of compression (central, foraminal, or mixed). Symptoms are typically insidious and progressive.
Lumbar Stenosis
Lumbar Stenosis Symptoms
- 01
Neurogenic claudication
Pain, heaviness, or tingling in the legs when walking, relieved by sitting or leaning the trunk forward.
- 02
Limited walking distance
Progressively reduced ability to walk without pauses — patients report covering shorter and shorter distances.
- 03
Low back pain
Axial pain in the lumbar region, generally less intense than the lower-limb symptoms.
- 04
Leg weakness
Sensation of "heavy legs" or instability when walking, especially over longer distances.
- 05
Lower-limb paresthesias
Tingling, numbness, or "pins and needles" in the feet, legs, or thighs.
- 06
Improvement on sitting or flexion
Significant relief when seated, leaning forward, or climbing stairs (lumbar flexion).
Cervical Stenosis and Myelopathy
Symptoms of Spondylotic Cervical Myelopathy
- 01
Gait disturbance
Spastic, unstable, wide-based gait — often the first sign of myelopathy.
- 02
Loss of manual dexterity
Difficulty buttoning shirts, writing, holding small objects, or using utensils.
- 03
Lhermitte sign
Electric-shock sensation running down the spine when bending the neck forward.
- 04
Hyperreflexia
Exaggerated reflexes in the lower limbs, positive Babinski reflex, and clonus.
- 05
Bladder dysfunction
Urinary urgency, hesitancy, or incontinence in advanced cases — alarm sign.
Diagnosis
Diagnosis of spinal stenosis combines clinical presentation with imaging findings. It is essential to correlate the patient's symptoms with the level and degree of narrowing shown on imaging, since isolated radiologic findings of stenosis are common in asymptomatic individuals.
🏥Diagnostic Workup of Spinal Stenosis
Fonte: North American Spine Society (NASS) Guidelines
Clinical Examination
- 1.Inclined treadmill test: reproducing claudication while walking on level ground versus on an incline
- 2.Romberg test: postural instability suggests myelopathy or proprioceptive impairment
- 3.Shopping cart sign: relief when leaning forward while walking
- 4.Segmental neurologic assessment: strength, sensation, and reflexes by root level
- 5.Babinski test and clonus: upper motor neuron signs in cervical stenosis
Imaging Studies
- 1.Magnetic resonance imaging: gold standard — assesses cord, roots, ligaments, and degree of stenosis
- 2.CT myelography: alternative when MRI is contraindicated
- 3.Dynamic radiographs (flexion-extension): assess associated instability
- 4.Central canal diameter < 12 mm suggests stenosis; < 10 mm indicates severe stenosis
DIAGNÓSTICO DIFERENCIAL
Differential Diagnosis
Vascular Claudication
- Calf pain on walking
- Absent peripheral pulses
- Does not relieve with trunk flexion
Testes Diagnósticos
- Ankle-brachial index
- Lower-limb arterial Doppler
Lumbar Disc Herniation
- Acute unilateral radicular pain
- Positive Lasegue
- Younger patient
Testes Diagnósticos
- Lumbar MRI
- Dermatomal pain pattern
Peripheral Neuropathy
- Symmetric stocking-glove paresthesia
- Not related to posture
- Diabetes or alcoholism
Testes Diagnósticos
- Electromyography
- Glucose and HbA1c
Spondylolisthesis
Read more →- Mechanical low back pain
- May coexist with stenosis
- Palpable spinal step-off
Testes Diagnósticos
- Dynamic radiograph
- Lumbar MRI
Cauda Equina Syndrome
- Saddle anesthesia
- Urinary retention or incontinence
- Surgical emergency
Testes Diagnósticos
- Urgent MRI
- Perineal examination
Treatments
Treatment of spinal stenosis follows a stepped approach, starting with conservative measures and progressing to more invasive interventions based on severity and clinical response. The therapeutic decision considers location, symptom intensity, and the presence of neurologic deficit.
In lumbar stenosis, conservative treatment is effective in many patients with mild to moderate symptoms. In cervical stenosis with myelopathy, the surgical indication tends to be earlier, since cord damage may be irreversible.
TREATMENT OPTIONS FOR SPINAL STENOSIS
| TREATMENT | INDICATION | EVIDENCE | CONSIDERATIONS |
|---|---|---|---|
| Lumbar flexion exercises | Mild to moderate lumbar stenosis | Moderate | Cornerstone of conservative treatment — increases canal diameter |
| Targeted physical therapy | Core strengthening and stabilization | Moderate | Supervised individualized program |
| Analgesic medication | Symptomatic control | Moderate | NSAIDs, gabapentinoids for neuropathic pain |
| Epidural injection | Refractory radicular pain | Moderate | Temporary relief, may delay surgery in some patients |
| Acupuncture and laser therapy | Chronic pain, functional improvement | Moderate | Adjunct to the exercise program |
| Surgical decompression | Neurologic deficit, myelopathy, conservative failure | Strong | Laminectomy, laminoplasty, or minimally invasive techniques |
| Arthrodesis (fusion) | Associated instability | Moderate | When there is spondylolisthesis or segmental instability |
Stepped Approach to Lumbar Stenosis
Phase 1
0-6 weeksInitial Conservative Treatment
Lumbar flexion exercises (Williams), analgesia with NSAIDs, gabapentin for the neuropathic component. Modify activities that provoke lumbar extension.
Phase 2
6-12 weeksRehabilitation Program
Core muscle strengthening, adapted aerobic exercise (cycling, swimming), acupuncture as adjunct for pain control.
Phase 3
3-6 monthsMinimally Invasive Interventions
Epidural corticosteroid injection for refractory claudication. Selective foraminal blocks for predominant radiculopathy.
Phase 4
After conservative failureSurgical Treatment
Decompression (laminectomy or laminotomy) indicated for progressive neurologic deficit, disabling refractory claudication, or myelopathy.
Acupuncture and Laser Therapy
Medical acupuncture has shown benefits as adjunctive treatment in spinal stenosis, particularly for chronic pain control and improvement of functional capacity. Clinical studies show that patients with lumbar stenosis who undergo acupuncture have increased walking distance and reduced pain scores.
Mechanisms involved include modulation of segmental nociceptive transmission at the compressed roots, reduction of perirradicular edema through improved local microcirculation, release of endogenous opioids (endorphins, enkephalins), and reduction of trigger point activity in the paraspinal muscles that contributes to axial pain.
Low-level laser therapy (photobiomodulation) complements acupuncture by promoting a local anti-inflammatory effect, microcirculation stimulation in compromised nerve roots, and modulation of neuropathic pain. The combination of acupuncture with laser therapy allows synergistic action on the nociceptive and neuropathic components of pain in stenosis.
Prognosis
The natural history of lumbar spinal stenosis is variable. Follow-up studies show that roughly one-third of patients improve spontaneously, one-third remain stable, and one-third experience progressive worsening over the years.
Conservative treatment maintains satisfactory results in 50-70% of patients with moderate lumbar stenosis after two years of follow-up. Decompressive surgery offers better functional results in the short term (1-2 years), but this difference tends to diminish over longer follow-up (4-8 years).
In cervical stenosis with myelopathy, prognosis depends critically on the duration and severity of symptoms before intervention. Patients operated on early have a greater chance of complete neurologic recovery. Advanced chronic myelopathy may show only partial recovery even after adequate decompression.
Myths and Facts
Myth vs. Fact
Spinal stenosis always requires surgery.
Most patients with lumbar stenosis improve with conservative treatment. Surgery is reserved for cases of progressive neurologic deficit, myelopathy, or failed conservative treatment.
If imaging shows stenosis, that explains my pain.
MRI findings of stenosis are common in asymptomatic people over 60. Diagnosis requires correlating clinical symptoms with imaging findings.
Physical exercise worsens spinal stenosis.
Lumbar flexion exercises, walking on an inclined treadmill, and cycling are beneficial. Inactivity accelerates functional loss. Adapt the program to avoid excessive spinal extension.
After stenosis surgery, I no longer need to exercise.
Postoperative rehabilitation with muscle strengthening is essential to maintain surgical results and prevent recurrence. Surgery resolves the compression but does not strengthen the muscles.
When to Seek Medical Help
Frequently Asked Questions about Spinal Stenosis
Spinal stenosis is the narrowing of the vertebral canal that houses the spinal cord and nerve roots. The most common cause is age-related joint degeneration: intervertebral discs lose height, facet joints become hypertrophic with osteophytes, and the ligamentum flavum thickens. Together, these changes reduce the space available for neural structures. It can affect the cervical, thoracic, or lumbar spine, with the lumbar form being the most frequent.
Neurogenic claudication (lumbar stenosis) causes pain, heaviness, and tingling in the legs when walking, relieved by sitting or leaning the trunk forward, and generally affects both legs asymmetrically. Vascular claudication (peripheral arterial disease) causes cramping pain in the calves, is relieved only by complete rest (no need to sit), and is associated with absent pulses and cold skin in the feet. The shopping cart test distinguishes the two: in neurogenic claudication, walking while leaning on the cart relieves the pain; in vascular claudication, it makes no difference.
No. Most patients with moderate lumbar stenosis improve with conservative treatment that includes lumbar flexion exercises, medication, and acupuncture. Surgery is indicated when there is progressive neurologic deficit, disabling claudication that fails to respond to 3-6 months of conservative treatment, or signs of cervical myelopathy. The decision is individualized, weighing symptom severity and patient comorbidities.
Acupuncture acts through multiple mechanisms in spinal stenosis: it modulates nociceptive transmission at the compressed nerve roots, improves perirradicular microcirculation to reduce edema, releases endogenous opioids for pain control, and relaxes the paraspinal muscles. Electroacupuncture at the paraspinal points of the affected level, combined with distal points in the lower limbs, has shown improvement in walking distance and pain scores in clinical trials.
Lumbar flexion exercises (such as bringing the knees to the chest while lying down) are most recommended, since they increase the vertebral canal diameter. Stationary cycling is excellent because it keeps the spine in slight flexion. An inclined treadmill lets the patient walk with the trunk slightly flexed. Swimming and water aerobics are safe because they reduce axial load. Avoid excessive lumbar extension, such as backbend exercises and long walks on level ground.
Cervical myelopathy is spinal cord dysfunction caused by chronic compression in the cervical spine. Symptoms include gait disturbance (spastic, unstable), loss of manual dexterity, hyperreflexia, and, in advanced cases, bladder dysfunction. It is considered severe because cord damage can be partially irreversible. Alarm signs that demand urgent evaluation include rapid gait deterioration, frequent falls, and urinary incontinence.
A typical initial cycle consists of 8 to 12 sessions, 1-2 times per week. Response is assessed by improvement in walking distance and pain scores. Patients with a good response may benefit from biweekly or monthly maintenance sessions. Acupuncture is most effective when integrated into a regular program of lumbar flexion exercises, maximizing functional gains.
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