Spinal Canal Stenosis: Symptoms and Treatment

Spinal canal stenosis is a degenerative condition characterized by narrowing of the spinal canal, which causes compression of nerve structures. It primarily affects those over 50 and represents one of the most frequent causes of lower back pain and walking difficulties in adulthood and elderly age. In this article we explore causes, symptoms, diagnosis and all available therapeutic options, with particular attention to the role of physiotherapy.

What is spinal canal stenosis

Spinal canal stenosis is a narrowing of the spinal canal in the spine that can compress nerves and cause pain, numbness, or weakness in the limbs. The spinal canal is the space inside the spinal column that houses the spinal cord and nerve roots. When this canal narrows — due to degenerative, congenital or acquired causes — the nerve structures become compressed, generating pain, neurological deficits and functional limitations.

For a complete overview, see the comprehensive guide to low back pain and iliopsoas.

For a complete overview, see the comprehensive guide to back pain and spine.

Stenosis can affect different sections of the spine:

• Lumbar stenosis (most frequent): involves the L3-L5 tract, where the canal is naturally narrower.
• Cervical stenosis: can cause cervical myelopathy with potentially serious consequences.
• Thoracic stenosis: rare, but possible in association with other degenerative pathologies.

It is also distinguished between:

• Central stenosis: narrowing of the spinal canal proper.
• Foraminal (lateral) stenosis: narrowing of the intervertebral foramen, from which nerve roots emerge.
• Lateral recess stenosis: involves the space between the disc and the articular facet.

It’s important to note that spinal canal stenosis is often associated with other degenerative conditions such as disc herniation, spondylolisthesis and disc protrusion, conditions that can coexist and worsen the clinical picture.

Causes and risk factors

Spinal canal stenosis is in most cases an acquired condition, linked to degenerative processes of the spinal column. The main causes include:

Degenerative causes (most common)

• Arthritis of the facet joints: hypertrophy of the facets reduces available space in the canal.
• Thickening of the ligamentum flavum: with age, this ligament loses elasticity and thickens, occupying space in the canal.
• Protrusions and disc herniations: disc material protrudes into the canal, reducing its diameter.
• Osteophytes: reactive bone formations that develop at the margins of vertebrae.
• Degenerative spondylolisthesis: slipping of one vertebra over another contributes to narrowing.

Congenital causes

Some individuals are born with a constitutionally narrow spinal canal (congenital stenosis). These people may become symptomatic even with modest degenerative changes that would not cause problems in normal subjects.

Risk factors

• Age over 50: the main risk factor.
• Genetic predisposition: constitutional dimensions of the canal.
• Overweight and obesity: increase load on the spine.
• Sedentary lifestyle: muscle weakness accelerates degeneration.
• Heavy work or repetitive vibrations: early wear of vertebral structures.
• Adult scoliosis: spinal deformities can contribute to asymmetric narrowing of the canal.

Symptoms of spinal canal stenosis

Symptoms of stenosis vary based on the location and severity of the narrowing. In the lumbar form, which is the most common, the clinical picture is quite characteristic.

Neurogenic claudication: the cardinal symptom

Neurogenic claudication (or intermittent neurogenic claudication) is the most typical symptom of lumbar stenosis. It manifests with:

• Pain, heaviness or weakness in the lower limbs during walking or prolonged standing.
• Symptoms appear after a variable distance walked (walking tolerance) and force the patient to stop.
• Improvement with trunk flexion: sitting, bending forward or squatting relieves symptoms because lumbar flexion widens the spinal canal.
• Typically the patient finds relief by leaning on a shopping cart (flexed position), a phenomenon known as the “shopping cart sign”.

Difference between neurogenic and vascular claudication

It’s essential to distinguish neurogenic claudication from vascular claudication (caused by peripheral arterial insufficiency):

Other frequent symptoms

• Lower back pain: chronic lumbar pain, often present for years.
• Sciatica: pain radiating along the sciatic nerve, unilateral or bilateral.
• Paresthesias: tingling, numbness or “pins and needles” sensation in the lower limbs.
• Muscle weakness: difficulty lifting the foot (foot drop in severe cases) or climbing stairs.
• Balance disorders: in more advanced cases.
• Sphincter disorders: rare, but possible in severe cases (cauda equina syndrome — surgical emergency).

Cervical stenosis: specific symptoms

In cervical stenosis symptoms may include:

• Cervical stiffness and pain.
• Weakness and clumsiness in the hands.
• Walking difficulties with spastic gait.
• In severe cases, signs of cervical myelopathy (urinary urgency, Lhermitte’s sign, hyperreflexia).

Diagnosis: how stenosis is identified

The diagnosis of spinal canal stenosis is based on the correlation between clinical picture and radiological imaging. A stenosis visible on MRI but without symptoms is not necessarily a pathological condition: studies show that up to 20% of asymptomatic over-60s have stenosis on magnetic resonance imaging (Boden et al., JBJS 1990; Ishimoto et al., Spine 2013).

Clinical examination

The physical therapist and doctor evaluate:

• Detailed history: walking tolerance, onset and resolution of symptoms, aggravating and alleviating activities.
• Provocation tests: lumbar extension test (reproduces symptoms), flexion test (relieves them).
• Neurological examination: reflexes, muscle strength, sensation.
• Specific tests: treadmill test, two-stage treadmill test.
• Vascular evaluation: palpation of peripheral pulses to exclude vascular claudication.

Instrumental examinations

• Magnetic Resonance Imaging (MRI): gold standard examination. Allows visualization of the degree of stenosis, compression of nerve structures, disc and ligament status.
• CT (Computed Tomography): useful for evaluating bone components, particularly osteophytes and facet hypertrophy.
• Standard radiography: useful for initial evaluation of alignment, spondylolisthesis, instability (dynamic radiographs in flexion/extension).
• Electromyography (EMG): in selected cases, to evaluate root damage.

Severity classification

The Schizas classification (2010) evaluates lumbar stenosis on MRI based on the ratio between nerve structures and cerebrospinal fluid in the dural sac:

• Grade A: mild stenosis — nerve roots well separated from cerebrospinal fluid.
• Grade B: moderate stenosis — posterior grouping of roots.
• Grade C: severe stenosis — roots not individually distinguishable.
• Grade D: extreme stenosis — complete absence of cerebrospinal fluid, massive compression.

Conservative treatment: the central role of physiotherapy

International guidelines (NASS – North American Spine Society, NICE) recommend conservative treatment as first choice in lumbar stenosis, except in cases with progressive neurological deficits or cauda equina syndrome.

Physiotherapy represents the pillar of conservative treatment and has demonstrated efficacy in improving walking capacity, reducing pain and improving quality of life.

Physiotherapy treatment objectives

1. Reduce pain and inflammation in acute phases.
2. Improve walking tolerance (primary objective for the patient).
3. Strengthen trunk stabilizing musculature to support the spine.
4. Maintain and improve flexibility of the spine and lower limbs.
5. Educate the patient in long-term condition management.

Multimodal physiotherapy approach

An effective rehabilitation program for stenosis includes:

• Manual therapy: joint mobilizations, myofascial techniques, manual traction. Lumbar traction can temporarily widen the canal and provide relief.
• Therapeutic exercise: the heart of the program (see dedicated section later).
• Patient education: explain the nature of the condition, self-management strategies, favorable postures.
• Physical agents: tecar therapy, TENS and laser therapy can contribute to pain management as adjuvants, but do not replace exercise.

Supportive drug therapy

In association with physiotherapy, the doctor may prescribe:

• NSAIDs (non-steroidal anti-inflammatory drugs) for short periods.
• Gabapentin or pregabalin: for neuropathic pain.
• Epidural corticosteroid injections: can provide temporary relief (weeks-months) and are particularly useful as a “therapeutic window” to allow the patient to begin a rehabilitation program.

Specific exercises for spinal canal stenosis

Therapeutic exercise is the intervention with the best scientific evidence in conservative treatment of lumbar stenosis. The fundamental principle is that lumbar flexion opens the spinal canal, while extension closes it. The exercise program must be personalized based on symptom severity and the patient’s physical condition.

Lumbar flexion exercises (canal opening)

Exercise 1: Knees to Chest (Supine)

Difficulty: Easy | Equipment: Mat | Duration: 5 minutes

Starting position:
Lie supine on a mat with knees bent and feet resting on the ground. Arms are alongside the body. The head is resting on the floor.

Step-by-step execution:

1. Step 1: Slowly bring one knee toward the chest, grasping it with both hands just below the kneecap. Then add the other knee.
2. Step 2: With both knees at the chest, gently pull toward yourself until you feel a comfortable stretch in the lumbar area. The lumbar area rounds and flattens against the floor.
3. Step 3: Hold the position for 20-30 seconds, breathing slowly and deeply with the diaphragm. Release with control, returning one foot at a time to the ground.

Sets and repetitions: 5-8 repetitions of 20-30 seconds each

Common errors to avoid:

• Lifting head and shoulders off the floor: creates unnecessary cervical tension that reduces lumbar area relaxation
• Pulling knees too abruptly: can cause defensive muscle spasm in the paravertebral musculature
• Holding breath: prevents muscle relaxation necessary to widen space in the spinal canal

How to know you’re doing it correctly:
You should feel immediate relief in the lumbar area and legs. This exercise widens space in the spinal canal, reducing compression on nerve structures. The sensation of heaviness or tingling in the legs should reduce during or after execution.

Exercise 2: Lumbar Flexion from Seated Position

Difficulty: Easy | Equipment: Stable chair | Duration: 3 minutes

Starting position:
Seated on a stable chair, with feet well planted on the ground at hip width. Hands resting on thighs.

Step-by-step execution:

1. Step 1: Take a deep breath, then during exhalation slowly begin to bend forward, letting the trunk descend between the knees.
2. Step 2: Bring the chest as close as possible to the knees, letting arms hang relaxed toward the floor. The lumbar area naturally rounds.
3. Step 3: Hold the position for 15-20 seconds, breathing deeply. Return slowly, unrolling the spine vertebra by vertebra, starting from the lumbar area.

Sets and repetitions: 5 repetitions of 15-20 seconds each

Common errors to avoid:

• Rising too quickly from the flexed position: can cause dizziness due to rapid pressure change and blood redistribution
• Forcing flexion beyond the comfort limit: should be a gentle and relaxed movement, not forced
• Sitting on an unstable or wheeled chair: base stability is essential for exercise safety

How to know you’re doing it correctly:
You should feel a pleasant stretch in the lumbar area and a sense of decompression. Leg symptoms (heaviness, tingling) should reduce in the flexed position. This exercise is particularly useful during work breaks or after walking.

Exercise 3: Child’s Pose

Difficulty: Easy | Equipment: Mat | Duration: 5 minutes

Starting position:
Kneeling on the mat, with buttocks resting on heels. Knees can be together or slightly apart (more comfortable for those with knee problems). Arms are alongside the body.

Step-by-step execution:

1. Step 1: Inhale, then during exhalation slowly bend forward, sliding hands on the floor in front of you.
2. Step 2: Extend arms forward on the floor, lowering the trunk until bringing the forehead in contact with the mat (or on a pillow if you don’t reach the floor). Buttocks remain in contact with heels.
3. Step 3: Completely relax the back musculature and breathe deeply for 30-60 seconds. To return up, use hands to push and rise slowly.

Duration: 30-60 seconds, repeat 3-5 times

Common errors to avoid:

• Lifting buttocks from heels: reduces lumbar flexion and decreases decompressive effect on the spinal canal
• Forcing position in case of knee pain: in this case, place a pillow between buttocks and heels or between thighs and calves
• Holding breath: deep breathing is an integral part of this exercise’s effectiveness

How to know you’re doing it correctly:
You should feel a sensation of stretch and decompression along the entire lumbar spine. The paravertebral musculature progressively relaxes. This position is particularly effective for stenosis because it maximizes lumbar flexion and therefore opening of the spinal canal.

Exercise 4: Pelvic Tilt (Supine)

Difficulty: Easy | Equipment: Mat | Duration: 5 minutes

Starting position:
Lie supine on a mat with knees bent at about 90 degrees and feet resting on the ground at hip width. Arms are alongside the body.

Step-by-step execution:

1. Step 1: Place one hand under the lumbar area to perceive the space between the back and the floor (natural lordotic curve).
2. Step 2: Gently contract the lower abdominals and glutes, flattening the lumbar area against the floor and eliminating the space under the back. The pelvis rotates slightly upward (retroversion).
3. Step 3: Hold the position for 5-10 seconds, breathing normally. Release and repeat.

Sets and repetitions: 10-15 repetitions — 2-3 sets — 20-second pause between sets

Common errors to avoid:

• Lifting the pelvis off the floor (transforming the exercise into a bridge): retroversion is a much more subtle movement, the pelvis remains in contact with the floor
• Contracting the superficial abdominals excessively: the contraction should be gentle and controlled
• Holding breath: breathing should continue normally throughout the contraction

How to know you’re doing it correctly:
The hand placed under the lumbar area gets “squeezed” against the floor by pelvic retroversion. You should feel a slight contraction of the lower abdominals and glutes, without excessive effort. This exercise opens the spinal canal by reducing lumbar lordosis.

Core stabilization exercises

Exercise 5: Transverse Abdominis Activation

Difficulty: Easy | Equipment: Mat | Duration: 5 minutes

Starting position:
Lie supine on a mat with knees bent at about 90 degrees and feet on the ground at hip width. Arms are alongside the body. The lumbar spine maintains its natural curve.

Step-by-step execution:

1. Step 1: Place fingertips 2 cm medially and inferiorly to the anterior superior iliac spines to monitor contraction.
2. Step 2: Inhale with the diaphragm, then during exhalation gently contract the deep abdominals imagining “pulling the navel toward the spine.” The contraction is light (about 30% of maximum effort).
3. Step 3: Hold the contraction for 10 seconds continuing to breathe normally. Release and repeat.

Sets and repetitions: 10 repetitions — 2-3 sets — 20-second pause between sets

Common errors to avoid:

• Holding breath: correct transverse abdominis activation allows normal breathing during contraction
• Contracting superficial abdominals forcefully: the rectus abdominis should not “bulge”; correct contraction is deep and subtle
• Retroverting pelvis or flattening lumbar area: indicates incorrect activation of superficial muscles instead of the transverse abdominis

How to know you’re doing it correctly:
Under the fingertips you should feel slight hardening (transverse abdominis tension) without visible trunk or pelvis movements. This is the fundamental exercise, the foundation of all stabilization exercises for spinal canal stenosis.

Exercise 6: Bridge

Difficulty: Intermediate | Equipment: Mat | Duration: 5 minutes

Starting position:
Lie supine on a mat, knees bent at about 90 degrees, feet on ground at hip width. Arms are alongside the body with palms facing down.

Step-by-step execution:

1. Step 1: Activate the transverse abdominis (as in Exercise 5) and contract the glutes.
2. Step 2: Press feet into the floor and lift pelvis vertebra by vertebra, until forming a straight line between shoulders, hips and knees. Do not hyperextend the lumbar area.
3. Step 3: Hold the position for 5-10 seconds, breathing normally. Lower pelvis slowly, vertebra by vertebra.

Sets and repetitions: 10 repetitions — 2-3 sets — 30-second pause between sets

Common errors to avoid:

• Hyperextending the lumbar area: in stenosis, extension further closes the spinal canal and can worsen symptoms. Lift pelvis only until shoulder-hip-knee alignment
• Distributing weight only on heels: causes hamstring cramps and reduces glute activation
• Performing the movement quickly: slow control is fundamental for effectiveness and safety

How to know you’re doing it correctly:
You should feel strong contraction of glutes and abdominals, without lumbar pain or leg symptoms. The bridge strengthens glutes and posterior musculature, essential for spinal support in stenosis.

Exercise 7: Modified Bird-Dog

Difficulty: Intermediate | Equipment: Mat | Duration: 5 minutes

Starting position:
On hands and knees on a mat, hands under shoulders and knees under hips. The spine is in neutral position or in very slight flexion (never in extension). Gaze is toward the floor.

Step-by-step execution:

1. Step 1: Activate the transverse abdominis, stabilizing the spine. In stenosis, it’s important not to let the lumbar area arch.
2. Step 2: Slowly extend the right arm forward and simultaneously the left leg backward. In the modified version for stenosis, the leg extends only to trunk line (not beyond), to avoid lumbar hyperextension.
3. Step 3: Hold the position for 5 seconds, then return with control to starting position. Alternate with left arm and right leg.

Sets and repetitions: 8 repetitions per side — 2 sets — 30-second pause between sets

Common errors to avoid:

• Hyperextending the lumbar area during leg extension: in stenosis, lumbar extension closes the canal and can aggravate symptoms. Maintain spine in neutral position or slight flexion
• Lifting leg too high: bringing it to trunk line is sufficient; beyond generates counterproductive lumbar extension
• Losing pelvis stability with lateral rotations: pelvis must remain horizontal

How to know you’re doing it correctly:
You should feel deep stabilization work in the trunk, without increased leg symptoms (heaviness, tingling, pain). If symptoms worsen, reduce range of motion or perform only arm extension without the leg.

Flexibility exercises

Exercise 8: Hamstring Stretching

Difficulty: Easy | Equipment: Mat, towel or strap | Duration: 5 minutes

Starting position:
Lie supine on a mat with both knees bent and feet on ground. Pass a towel (or strap) under the sole of the leg to be stretched.

Step-by-step execution:

1. Step 1: Holding both ends of the towel with hands, slowly raise the leg toward the ceiling, progressively extending the knee (maintain slight flexion if necessary).
2. Step 2: Gently pull the towel toward yourself until feeling moderate tension in the back of the thigh. Shoulders and head remain relaxed on the ground.
3. Step 3: Hold the position for 20-30 seconds, breathing deeply. Slowly return the leg to the ground and repeat with the other side.

Sets and repetitions: 3 repetitions of 20-30 seconds per side

Common errors to avoid:

• Forcing complete knee extension: if hamstrings are tight, maintain slight knee flexion to avoid irritating the sciatic nerve
• Lifting head and shoulders off the floor: generates cervical tension that reduces stretching effectiveness
• Performing stretching with bouncing (ballistic) movements: can cause muscle micro-injuries and reflex spasm

How to know you’re doing it correctly:
You should feel moderate and tolerable tension in the back of the thigh, which progressively reduces during position holding. Hamstring tightness modifies lumbar biomechanics and can worsen stenosis symptoms: this stretching is therefore particularly important.

Exercise 9: Psoas-Iliacus Stretching

Difficulty: Intermediate | Equipment: Mat, pillow (optional) | Duration: 5 minutes

Starting position:
Position yourself in a lunge with one knee on the ground (place a pillow under the knee for comfort) and the opposite foot forward, with front knee bent at about 90 degrees. The trunk is erect, hands rest on the front knee.

Step-by-step execution:

1. Step 1: Activate the core and lightly contract the glute of the side with knee on ground.
2. Step 2: Slowly shift weight forward, pushing pelvis forward and downward, until feeling a stretch in the front of the hip of the posterior leg (psoas-iliacus region).
3. Step 3: Hold the position for 20-30 seconds, breathing deeply. Return to starting position and repeat with other side.

Sets and repetitions: 3 repetitions of 20-30 seconds per side

Common errors to avoid:

• Excessively arching the lumbar area during lunge: in stenosis, lumbar hyperextension is counterproductive. Keep core active and pelvis in slight retroversion
• Moving front knee beyond toe tip: generates excessive stress on knee joint
• Leaning sideways or rotating trunk: trunk should remain erect and oriented forward

How to know you’re doing it correctly:
You should feel a stretch in the front of the hip and inguinal area of the posterior leg. The lumbar area should not arch or feel pain. A shortened psoas-iliacus increases lumbar lordosis and contributes to spinal canal closure.

Exercise 10: Sciatic Nerve Mobilization (Nerve Flossing)

Difficulty: Intermediate | Equipment: Mat | Duration: 5 minutes

Starting position:
Lie supine on a mat. Bend the hip of the leg to be treated to about 90 degrees, holding the thigh with interlaced hands behind the knee. The knee is initially bent.

Step-by-step execution:

1. Medical disclaimer: The information in this article is for educational and informational purposes only. It does not replace the advice of a doctor or physiotherapist. For diagnosis and treatment, please consult your trusted doctor or physiotherapist.

   For a broader overview of related conditions, see our back pain guide.

   Sources and Scientific References

   1. Webb CW et al. (2024). Lumbar Spinal Stenosis: Diagnosis and Management. Am Fam Physician. 109:350-359. PubMed
   2. Kalichman L et al. (2008). Diagnosis and conservative management of degenerative lumbar spondylolisthesis. Eur Spine J. 17:327-335. DOI | PubMed
   3. Schneider MJ et al. (2019). Comparative Clinical Effectiveness of Nonsurgical Treatment Methods in Patients With Lumbar Spinal Stenosis: A Randomized Clinical Trial. JAMA Netw Open. 2:e186828. DOI | PubMed
   4. Papanagiotou P et al. (2014). [Spinal canal stenosis]. Radiologe. 54:1087-92. DOI | PubMed
   5. Abdou A et al. (2025). Lumbar Spinal Stenosis: Pathophysiology, Biomechanics, and Innovations in Diagnosis and Management. J Spine Res Surg. 7:1-17. DOI | PubMed

   Frequently Asked Questions

   What is spinal canal stenosis?

   Spinal canal stenosis is a degenerative condition characterized by the narrowing of the spinal canal, which compresses the spinal cord and nerve roots. This primarily affects individuals over 50, leading to pain, neurological deficits, and difficulties with walking and lower back discomfort.

   What are the main causes of spinal canal stenosis?

   The most common causes are degenerative processes linked to aging, such as arthritis of the facet joints, thickening of the ligamentum flavum, and disc protrusions. These changes reduce the space available for nerve structures within the spinal canal.

   What are the typical symptoms of spinal canal stenosis?

   The cardinal symptom is neurogenic claudication, which involves pain, tingling, or weakness in the legs that worsens with walking and improves with sitting or leaning forward. Patients often experience lower back discomfort and limitations in their walking ability.

   Is physiotherapy an effective treatment for spinal canal stenosis?

   Yes, physiotherapy plays a central and crucial role in the conservative management of spinal canal stenosis. It focuses on specific exercises like lumbar flexion, core stabilization, and flexibility to help open the canal, reduce nerve compression, and improve functional mobility.

   When should I consider surgery for spinal canal stenosis?

   Surgery is typically considered when conservative treatments, including physiotherapy and medication, fail to provide adequate relief or when there are signs of progressive neurological deficits. A trusted doctor or physical therapist can help determine if surgery is indicated based on your specific condition and symptoms.