What Is Spinal Stenosis?
Spinal stenosis (椎管狭窄) is a condition in which the spinal canal — the bony channel that houses and protects the spinal cord and nerve roots — becomes abnormally narrowed. This narrowing compresses the neural structures within the canal, causing pain, numbness, weakness, and in severe cases, loss of bladder or bowel control.
Spinal stenosis is one of the most common causes of back and leg pain in adults over 50, and is the leading reason for spinal surgery in older adults. It can affect any level of the spine, but is most common in the lumbar spine (lower back) and cervical spine (neck).
Anatomy: Understanding the Spinal Canal
The spine consists of 33 vertebrae stacked on top of each other, forming a protective bony column around the spinal cord. Between each pair of vertebrae are:
- Intervertebral discs: Shock-absorbing cushions made of a tough outer ring (annulus fibrosus) and a gel-like center (nucleus pulposus)
- Facet joints: Small joints at the back of each vertebra that allow controlled movement
- Foramina: Openings on each side of the vertebrae through which nerve roots exit the spinal canal
The spinal canal runs through the center of this column. In a healthy spine, there is adequate space for the spinal cord and nerve roots. In spinal stenosis, this space is reduced — compressing the neural structures and causing symptoms.
Types of Spinal Stenosis
By Location
- Lumbar spinal stenosis (腰椎管狭窄): The most common type; affects the lower back; causes leg pain, weakness, and the characteristic symptom of neurogenic claudication (see below)
- Cervical spinal stenosis (颈椎管狭窄): Affects the neck; can compress the spinal cord itself (cervical myelopathy), causing hand clumsiness, gait disturbance, and in severe cases, paralysis
- Thoracic spinal stenosis (胸椎管狭窄): Least common; affects the mid-back; can cause trunk and leg symptoms
By Cause
- Degenerative (acquired) stenosis: By far the most common; results from age-related wear and tear of the spine
- Congenital stenosis: Born with a naturally narrow spinal canal; symptoms typically appear earlier in life
- Combined: Congenitally narrow canal with superimposed degenerative changes
Causes and Risk Factors
The most common cause of spinal stenosis is degenerative spondylosis — the gradual age-related deterioration of the spinal structures. Multiple changes contribute simultaneously:
- Disc degeneration and bulging: As intervertebral discs lose water content and height with age, they bulge outward into the spinal canal, reducing available space
- Disc herniation (椎间盘突出): The gel-like nucleus pulposus ruptures through the outer ring and protrudes into the canal, directly compressing nerve roots
- Facet joint hypertrophy: The facet joints enlarge due to osteoarthritis, encroaching on the canal from behind
- Ligamentum flavum hypertrophy and buckling: The yellow ligament running along the back of the canal thickens and buckles inward, further narrowing the canal
- Osteophyte formation (bone spurs): Bony outgrowths develop at the edges of vertebrae and facet joints, projecting into the canal
- Spondylolisthesis (脊椎滑移): One vertebra slips forward over the one below, causing canal narrowing at that level
Risk factors include: Age over 50, female sex (for lumbar stenosis), obesity, history of spinal injury or surgery, and occupations involving heavy lifting or prolonged spinal loading.
Symptoms
Lumbar Spinal Stenosis
The hallmark symptom of lumbar stenosis is neurogenic claudication (神经源性间歇性跛行) — a distinctive pattern of leg pain, heaviness, numbness, or weakness that:
- Comes on with walking or prolonged standing
- Is relieved by sitting down, leaning forward, or squatting (positions that open the spinal canal)
- Worsens when walking downhill or standing upright (positions that narrow the canal)
- Typically affects both legs (bilateral), though one side may be worse
This pattern distinguishes neurogenic claudication from vascular claudication (caused by arterial disease), which is also relieved by rest but not by posture change, and is not affected by leaning forward.
Other symptoms of lumbar stenosis include:
- Low back pain, often dull and aching
- Radiating pain down the legs (sciatica-like), often in a dermatomal distribution
- Numbness and tingling in the legs and feet
- Leg weakness, particularly with prolonged walking
- In severe cases: bladder or bowel dysfunction (urinary urgency, incontinence) — a red flag requiring urgent evaluation
Cervical Spinal Stenosis / Myelopathy
Cervical stenosis can cause two distinct syndromes:
- Cervical radiculopathy (颈椎神经根病): Compression of individual nerve roots causes pain, numbness, and weakness radiating into the arm and hand in a specific pattern depending on the level affected
-
Cervical myelopathy (颈椎脊髓病): Compression of the spinal cord itself causes more diffuse symptoms including:
- Hand clumsiness and loss of fine motor control (difficulty buttoning shirts, writing)
- Gait disturbance and balance problems ("walking on cotton")
- Weakness in arms and/or legs
- Lhermitte's sign: electric shock sensation down the spine when bending the neck forward
- Bladder dysfunction
- In severe cases: progressive spastic paraparesis or quadriparesis
Cervical myelopathy is a surgical emergency if progressing rapidly — delayed treatment can result in permanent neurological deficits.
Diagnosis
- MRI (gold standard): Provides detailed visualization of the spinal canal, disc herniations, ligament hypertrophy, and neural compression; no radiation; essential for surgical planning
- CT scan: Better for visualizing bony structures (osteophytes, facet hypertrophy); often used in combination with MRI or when MRI is contraindicated
- CT myelography: Contrast injected into the spinal fluid followed by CT; used when MRI is unavailable or for complex post-surgical cases
- X-rays (standing): Assess spinal alignment, spondylolisthesis, and disc height loss; useful for dynamic instability assessment
- Electromyography (EMG) / Nerve conduction studies (NCS): Assess nerve function; help differentiate spinal stenosis from peripheral neuropathy
- Vascular studies (ABI, Doppler): To exclude vascular claudication when the diagnosis is uncertain
Treatment
Conservative (Non-Surgical) Treatment
Most patients with lumbar stenosis can be managed conservatively, at least initially. Conservative treatment does not reverse the structural narrowing but can effectively manage symptoms:
- Physical therapy: Core strengthening, flexion-based exercises (which open the lumbar canal), and postural training; the most important non-surgical intervention
- NSAIDs and analgesics: For pain management; limited long-term use due to side effects
- Epidural steroid injections (ESI): Corticosteroid injected into the epidural space around the compressed nerves; provides temporary relief (weeks to months) and can help patients participate in physical therapy; not a permanent solution
- Activity modification: Using a walking aid (cane, walker) or shopping cart (which promotes forward flexion) to extend walking distance; cycling (which keeps the spine flexed) is often well-tolerated
- Weight loss: Reduces spinal loading
- Bracing: Lumbar corsets may provide short-term symptom relief
For cervical myelopathy, conservative treatment has a limited role — surgery is generally recommended once myelopathy is confirmed, as the condition tends to progress and neurological deficits may become permanent if untreated.
Surgical Treatment
Surgery is indicated when:
- Conservative treatment has failed after 3–6 months
- Symptoms are severe and significantly limiting daily activities
- Progressive neurological deficits are present (weakness, bladder/bowel dysfunction)
- Cervical myelopathy is confirmed
Lumbar Stenosis Surgery
- Laminectomy / Decompressive laminectomy (椎板切除术): Removal of the lamina (back of the vertebra) and thickened ligament to create more space for the nerves; the most common surgical procedure for lumbar stenosis; can be performed as open surgery or minimally invasively
- Laminotomy / Laminoplasty: Partial removal or reshaping of the lamina; preserves more bone and stability than full laminectomy
- Foraminotomy: Enlargement of the foramen (nerve exit opening) to decompress a specific nerve root
- Spinal fusion (脊椎融合术): Added when there is instability or spondylolisthesis; vertebrae are fused together using bone graft and instrumentation (screws and rods); prevents abnormal movement but reduces flexibility at the fused level
- Minimally invasive spine surgery (MISS): Smaller incisions, less muscle damage, faster recovery; available at leading centers in Shanghai
- Interspinous process devices: Spacers inserted between spinous processes to maintain canal opening; suitable for selected patients with mild to moderate stenosis
Cervical Stenosis Surgery
- Anterior cervical discectomy and fusion (ACDF): Approach from the front of the neck; disc removed and vertebrae fused; standard for 1–2 level disease
- Cervical disc arthroplasty (artificial disc replacement): Preserves motion at the treated level; alternative to fusion for selected patients
- Posterior cervical laminoplasty (颈椎板成形术): Approach from the back of the neck; lamina is hinged open to expand the canal; preserves motion; preferred for multi-level cervical myelopathy
- Posterior cervical laminectomy with fusion: For cases with instability or significant deformity
Why Seek Treatment in Shanghai?
Shanghai has world-class expertise in spinal surgery, with high-volume centers experienced in both minimally invasive and complex reconstructive procedures:
- Changzheng Hospital (长征医院): China's leading spine surgery center, with one of the highest volumes of spinal procedures in Asia. The department has pioneered minimally invasive techniques and complex spinal reconstruction, including treatment of severe scoliosis, spinal tumors, and multi-level stenosis
- Huashan Hospital: The Neurosurgery Department at Huashan Hospital has extensive expertise in cervical myelopathy surgery and complex spinal cord decompression, with specialists including Dr. Zhang Xiaobiao experienced in minimally invasive spinal neurosurgery
- Zhongshan Hospital: Strong orthopedic and spine surgery program; see the Zhongshan Hospital Complete Guide
- Dr. Yang Changwei's team: Expert in complex spinal deformity and disc disease; see Scoliosis & Disc Herniation | Dr. Yang Changwei
Who Should Consider Seeking Care in Shanghai?
- Patients with lumbar stenosis and neurogenic claudication who have failed conservative treatment and are considering surgery
- Patients with cervical myelopathy requiring urgent surgical decompression
- Patients with multi-level stenosis or complex spinal pathology requiring experienced surgical teams
- Patients seeking minimally invasive spinal surgery to reduce recovery time
- Patients who have been told surgery is too risky or complex elsewhere, seeking a second surgical opinion
- Patients with recurrent stenosis after previous spinal surgery requiring revision procedures
What to Expect: Your Care Journey with CMCS
China Medical Concierge Shanghai (CMCS) coordinates specialist consultations for spinal stenosis, connecting you with the right spine surgeon or neurosurgeon based on your specific condition and needs.
- Pre-arrival review: We review your MRI scans, X-rays, and clinical history to identify the most appropriate specialist
- Specialist matching: We connect you with the right spine surgeon (orthopedic or neurosurgical) based on your stenosis level and complexity
- Appointment coordination: We schedule consultations, repeat imaging if needed, and surgical planning sessions
- Interpretation and translation: Our bilingual coordinators accompany you to all appointments
- Surgical coordination: If surgery is recommended, we manage all pre-operative preparations and post-operative follow-up arrangements
To discuss your case or request a consultation, contact us:
0 commentaire