Cervical Spondylotic Myelopathy
Spinal cord compression from age-related cervical spine degeneration
ICD-10: M47.12 · cervical condition
Cervical spondylotic myelopathy (CSM) is the most common cause of spinal cord dysfunction in adults over 50. It results from progressive degenerative changes in the cervical spine — including disc herniation, bone spur formation, ligamentum flavum thickening, and facet hypertrophy — that narrow the spinal canal and compress the spinal cord. Unlike radiculopathy, which compresses individual nerve roots, myelopathy injures the cord itself, producing more widespread neurological deficits. Patients typically notice subtle early changes: clumsiness in the hands, difficulty with fine motor tasks such as buttoning shirts, and a broad-based unsteady gait. Neck pain may be absent or mild. As compression worsens, upper motor neuron signs emerge, including spasticity, hyperreflexia, and in severe cases, bowel or bladder dysfunction. CSM is a progressive condition that rarely improves without treatment. Once moderate deficits are present, surgical decompression — via anterior cervical discectomy and fusion (ACDF), cervical disc arthroplasty, or posterior laminectomy — is typically recommended to halt neurological decline and achieve partial recovery. Outcomes are best when surgery is performed before severe cord injury occurs.
Anatomy & Pathology
The cervical spinal cord occupies the central canal from the foramen magnum (C0) to approximately the C7-T1 junction. At each cervical level the cord gives off paired ventral (motor) and dorsal (sensory) nerve roots that combine to form the exiting spinal nerves. The cord's cross-sectional diameter is roughly 13 mm; when the canal narrows below 10 mm (critical stenosis), cord compression and ischemia become clinically significant. The corticospinal tracts (motor) and dorsal columns (proprioception/vibration) are the most vulnerable white-matter tracts in CSM, explaining the characteristic combination of spastic weakness and loss of position sense.
Symptoms
- Hand clumsiness and loss of fine motor coordination
- Broad-based unsteady gait (myelopathic gait)
- Bilateral arm numbness or tingling
- Leg weakness and spasticity
- Positive Lhermitte sign (electric shock sensation down spine with neck flexion)
- Hyperreflexia and upgoing Babinski sign
- Bowel or bladder dysfunction in advanced cases
Causes & Risk Factors
- Age-related cervical disc degeneration and herniation
- Osteophyte (bone spur) formation encroaching on the spinal canal
- Ligamentum flavum hypertrophy and buckling
- Congenitally narrow cervical spinal canal (increased susceptibility)
- Ossification of the posterior longitudinal ligament (OPLL)
Imaging Findings
Imaging studies are commonly used to identify findings associated with this condition. Results vary by individual; a qualified spine specialist interprets findings in the context of a full clinical evaluation.
MRI
- Diagnostic hallmark: Multilevel cervical cord compression from combined disc herniation, osteophytes, and ligamentum flavum hypertrophy
- T2 cord hyperintensity (myelomalacia or edema) — present in 20–60% of symptomatic CSM; indicates more advanced disease
- T1 cord hypointensity at the compression site in severe chronic myelopathy
- Axial images at each compressed level quantify canal diameter and cord flattening
- Signal change extent on sagittal T2 correlates with severity and, when extensive, with poorer surgical outcomes
CT Scan
- Osteophyte formation and OPLL characterization — CT superior to MRI for bony pathology
- Canal diameter measurement: <10 mm is critical stenosis; 10–13 mm relative stenosis
- Extent of ossification and segmental involvement guides anterior vs. posterior surgical approach
X-Ray
- Multilevel disc space narrowing and osteophyte formation on lateral view
- Cervical alignment: kyphosis versus lordosis — critical for surgical planning
- Dynamic flexion-extension views assess segmental instability contributing to cord injury
Who Is Commonly Affected
The following patterns are commonly associated with this condition based on published population studies. Individual presentation varies; these figures are informational only.
Peak Age Range
50–70 years
Gender Distribution
Male predominance (approximately 2:1)
Estimated Prevalence
Most common cause of spinal cord dysfunction in adults over 55; prevalence increases with age and degree of cervical spondylosis; estimated to affect 1–2% of adults over 60 with clinically significant symptoms
Treatment Options
Conservative
- Cervical immobilization with soft collar (for mild cases only)
- Physical therapy to improve strength and gait safety — not to decompress cord
- Close neurological monitoring with serial MRI for mild stable disease
Surgical
- Anterior cervical discectomy and fusion (ACDF) — removes disc and bone spurs from front
- Cervical laminectomy with or without fusion — posterior decompression of spinal canal
- Cervical laminoplasty — door-hinge expansion of canal preserving posterior elements
When to see a spine specialist
Seek evaluation from a spine specialist if you notice hand clumsiness, difficulty walking, or unexplained balance problems — even without significant neck pain. CSM can worsen rapidly after minor trauma. Any sudden deterioration in hand function, gait, or bladder control requires urgent evaluation as an emergency.
Specialists Who Treat Cervical Spondylotic Myelopathy
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Questions to Ask Your Doctor
Bring these questions to your next appointment about cervical spondylotic myelopathy.
- 1
Am I showing signs of myelopathy — hand clumsiness, Lhermitte's sign, gait instability — and how severe are they on standard clinical scales?
- 2
Is my cord showing signal change on MRI, and what does that mean for my prognosis with and without surgery?
- 3
Would an anterior or posterior decompression be better for my pattern of stenosis and cord involvement?
- 4
If I choose non-surgical management, how often should I be re-imaged, and what symptoms should prompt me to seek urgent care?
- 5
What is my risk of neurological deterioration without intervention, and how does that weigh against the risks of surgery?
Research Evidence
No studies reviewed yet for this condition. Check back soon — our evidence pipeline runs nightly.
Clinical Evidence
Key Research
- L4Pathophysiology and natural history of cervical spondylotic myelopathy
- L4Nonoperative management of cervical myelopathy: a systematic review
- L4Anterior vs posterior approaches in the management of multilevel degenerative cervical myelopathy: a systematic review and meta-analysis
- L4A systematic review and meta-analysis comparing anterior decompression with fusion and posterior laminoplasty for multilevel cervical spondylotic myelopathy
Frequently Asked Questions
Can cervical spondylotic myelopathy improve without surgery?
Mild, stable CSM may plateau without surgery in some patients, but spontaneous improvement is uncommon. The majority of untreated patients either stay the same or worsen over time. Conservative management is generally reserved for patients with very mild symptoms, those unfit for surgery, or while awaiting surgical scheduling. Most spine specialists recommend surgery once moderate functional deficits are present.
What is the modified Japanese Orthopaedic Association (mJOA) score?
The mJOA is a standardized scale (0–18) that quantifies myelopathy severity across upper extremity motor function, lower extremity motor function, sensation, and sphincter function. Scores of 15–18 indicate mild myelopathy, 12–14 moderate, and below 12 severe. It is used to guide surgical timing and measure post-operative recovery.
How much recovery can I expect after surgery for cervical myelopathy?
Most patients experience arrest of progression and partial neurological recovery. The Hirabayashi recovery rate formula (post-op mJOA − pre-op mJOA) ÷ (18 − pre-op mJOA) × 100% describes recovery; rates above 50–60% are considered good outcomes. Patients with mild-to-moderate preoperative deficits and shorter symptom duration generally recover more fully than those with severe or long-standing cord injury.