Degenerative Cervical Myelopathy

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What is Degenerative Cervical Myelopathy? Symptoms, Diagnosis, and When Surgery is Needed

Published by the eSpine Clinical Team — espine.com

Degenerative cervical myelopathy (DCM) is the most common cause of spinal cord dysfunction in adults worldwide, yet many patients go undiagnosed for years. If you have been told your cervical spine MRI shows cord compression, signal change, or myelopathy — or if you are experiencing progressive weakness, numbness, or difficulty walking — this guide will help you understand what is happening, what your imaging findings mean, and what the evidence says about treatment timing.

What Is Degenerative Cervical Myelopathy?

Degenerative cervical myelopathy is a progressive condition in which age-related changes in the cervical spine — the seven vertebrae in your neck — gradually compress the spinal cord. Unlike a single traumatic injury, DCM develops slowly over months to years as discs bulge, ligaments thicken, and bone spurs (osteophytes) form. This narrows the spinal canal, squeezing the cord and disrupting the nerve signals that control your arms, hands, legs, and bladder.

DCM is not a rare condition. It affects an estimated 1 in 1,000 people over the age of 50, and up to 5 in 1,000 people over 70. Despite its prevalence, it is frequently misdiagnosed as peripheral neuropathy, carpal tunnel syndrome, or simply “aging” — because its early symptoms can be subtle and non-specific.

What Causes It?

The underlying cause is degenerative change — the same process that causes disc herniation and osteoarthritis elsewhere in the body. Specific contributors include:

  • Disc degeneration and herniation — discs lose water content and height over time, bulging into the spinal canal
  • Ligamentum flavum hypertrophy — the ligament at the back of the canal thickens and buckles inward
  • Osteophyte formation — bony spurs develop at the edges of vertebral bodies and facet joints
  • Ossification of the posterior longitudinal ligament (OPLL) — more common in East Asian populations, causes significant canal narrowing

These changes most commonly occur at the C5-C6 and C6-C7 levels, where the cervical spine has the greatest range of motion and therefore the most wear over time.

Symptoms of Degenerative Cervical Myelopathy

DCM symptoms reflect the spinal cord’s role as the main communication highway between your brain and body. When that highway is compressed, signals become disrupted — and the pattern of disruption depends on which parts of the cord are affected.

Upper Extremity Symptoms (Hands and Arms)

  • Weakness or clumsiness in the hands — difficulty with fine motor tasks like buttoning shirts, writing, or using utensils
  • Numbness or tingling in the fingers, hands, or arms
  • Loss of grip strength
  • Dropping objects unexpectedly

Lower Extremity Symptoms (Legs and Balance)

  • Difficulty walking — a wide-based, unsteady gait
  • Leg weakness or heaviness
  • Increased falls or tripping
  • Difficulty climbing stairs

Bladder and Bowel Symptoms

In more advanced cases, DCM can affect bladder control — causing urinary urgency, frequency, or difficulty initiating urination. Bowel symptoms are less common but can occur. The presence of bladder or bowel symptoms typically indicates significant cord involvement and warrants urgent evaluation.

How Is DCM Diagnosed?

Clinical Examination

A spine surgeon or neurologist will look for specific signs that indicate myelopathy — including hyperreflexia (exaggerated reflexes), Hoffmann sign (a reflex response when the middle finger is flicked), positive Romberg test (unsteadiness with eyes closed), and the finger escape sign (inability to hold fingers extended and together).

MRI — The Gold Standard Imaging Study

MRI is the definitive imaging study for DCM. A T2-weighted sagittal MRI (the view from the side, looking at the cord from front to back) allows visualization of the cord, the surrounding CSF space, and any areas of compression or signal change. Key findings include:

  • Cord compression — the spinal cord appears narrowed or flattened at one or more levels, with reduction in the CSF space surrounding it
  • T2 hyperintense signal change — a bright signal within the cord at the level of compression, indicating myelomalacia (cord damage). This is one of the most important prognostic findings on MRI
  • Cord atrophy — thinning of the cord below the level of chronic compression
  • Cervical alignment — whether the spine maintains its normal lordotic (inward) curve, or has become kyphotic (outward), which has direct implications for surgical planning

The eSpine AI tool analyzes these specific MRI features — cord compression probability, curvature index, morphological anomaly detection, and vision AI assessment — to provide a structured educational summary of your imaging findings.

How Is Severity Measured? The mJOA Scale

The modified Japanese Orthopaedic Association (mJOA) scale is the internationally validated scoring system for measuring DCM severity. It assesses four functional domains — upper extremity motor function, lower extremity motor function, upper extremity sensation, and bladder function — with a maximum score of 18 (normal) and a minimum of 0 (complete dysfunction).

mJOA 15–18: Mild DCM

Symptoms are present but function is relatively preserved. Non-operative management (physical therapy, activity modification, close monitoring) is generally appropriate, with surgery reserved for patients who deteriorate or fail conservative treatment.

mJOA 12–14: Moderate DCM

Meaningful functional impairment. The evidence from the landmark Fehlings et al. AO Spine studies directly supports surgical intervention at this level — decompression is associated with significant neurological improvement and surgical intervention is recommended.

mJOA 0–11: Severe DCM

Significant cord dysfunction with major impact on daily activities. Based on the Fehlings et al. AO Spine guidelines, surgical intervention is strongly recommended. Early decompression in severe DCM is associated with significantly better neurological recovery outcomes compared to delayed treatment.

What Are the Surgical Options?

Surgical approach depends on the level and pattern of compression, the number of levels involved, and cervical alignment. The primary goal of all approaches is decompression of the spinal cord.

Anterior Cervical Discectomy and Fusion (ACDF)

The most commonly performed cervical spine operation worldwide. The disc is removed through the front of the neck, decompressing the cord, and the vertebral bodies are fused with a cage and plate. ACDF is appropriate for one to three level disease and can be performed in both lordotic and mildly kyphotic alignments.

Laminoplasty

A posterior approach that expands the spinal canal by hinging the laminae (the bony roof of the canal) open. Laminoplasty preserves motion and avoids fusion, but requires preserved or lordotic cervical alignment to be effective — the cord will not move away from anterior compression if the spine is kyphotic.

Laminectomy with Fusion

Removal of the laminae (posterior arch) combined with instrumented fusion. Appropriate for multilevel disease, kyphotic deformity correction, or when laminoplasty is not feasible. More stabilizing than laminoplasty but eliminates motion at the fused levels.

Artificial Disc Replacement (ADR)

A motion-preserving alternative to ACDF for single or two-level disease in carefully selected patients. ADR requires intact facet joints, adequate bone quality, and — critically — lordotic or neutral cervical alignment. It is contraindicated in the presence of significant myelopathy with cord signal change, kyphosis, or suspected non-degenerative pathology.

What Happens If DCM Is Left Untreated?

The natural history of DCM is not benign. Approximately 20–60% of patients with moderate or severe DCM will experience significant neurological deterioration if managed non-operatively. Deterioration can occur suddenly after minor trauma — a fall, a car accident, or even aggressive chiropractic manipulation — because the compressed cord has no reserve capacity to absorb additional insult.

The evidence also shows that neurological recovery after surgical decompression is better when surgery is performed earlier in the disease course — before the cord sustains irreversible damage. T2 signal change on MRI, indicating cord injury, is associated with worse neurological recovery even after successful decompression.

How eSpine Can Help

eSpine is a free, AI-assisted cervical spine MRI decision-support tool designed to help patients understand their imaging findings before meeting with a spine surgeon. By uploading a sagittal T2 MRI image, you receive:

  • An anomaly detection analysis using two independent AI pipelines — morphological and vision-based
  • A compression probability score based on morphometric analysis
  • A curvature index with surgical approach implications
  • Your mJOA score correlated with Fehlings et al. surgical timing recommendations
  • A plain-English Bottom Line summary of your results
  • An AI assistant to answer questions about your results and surgical options

eSpine is for educational purposes only and does not constitute medical advice. All findings should be reviewed with a qualified spine surgeon. Results are not a substitute for formal radiological interpretation.

Frequently Asked Questions

Is degenerative cervical myelopathy the same as a pinched nerve?

No. A pinched nerve (radiculopathy) involves compression of a nerve root exiting the spine, causing pain, numbness, or weakness in a specific arm or hand distribution. Myelopathy involves compression of the spinal cord itself, producing broader dysfunction affecting both arms, both legs, and potentially bladder function. Both can occur simultaneously.

Can DCM improve without surgery?

Mild DCM may remain stable or improve modestly with conservative management in some patients. However, moderate and severe DCM generally do not improve significantly without surgical decompression, and the risk of sudden deterioration with non-operative management is real. The AO Spine guidelines support surgery for moderate and severe DCM.

How long is recovery from cervical spine surgery?

Recovery varies by procedure and severity of pre-operative dysfunction. Most patients return to light activities within 4–6 weeks of ACDF. Neurological recovery — particularly improvement in hand function and walking — often continues for 12–18 months after decompression.

What does T2 signal change in my spinal cord mean?

T2 hyperintense signal within the spinal cord at the level of compression indicates myelomalacia — cord injury from chronic compression. Its presence is associated with more advanced disease and may predict a slower or less complete neurological recovery after surgery. It does not mean recovery is impossible, but it does suggest that earlier intervention is preferable.

Can I use the eSpine tool if I have a different spine condition?

The eSpine tool is calibrated for degenerative cervical myelopathy. If your MRI shows a different pathology — such as an epidural abscess, tumor, demyelinating disease, or vascular malformation — the procedure recommendations generated by the tool will not apply. The anomaly detection pipelines will flag non-DCM findings, and the Bottom Line summary will note that recommendations are contingent on the underlying diagnosis.

Key References

  • Fehlings MG, et al. A Clinical Practice Guideline for the Management of Patients With Degenerative Cervical Myelopathy. Global Spine Journal. 2017.
  • Nouri A, et al. Degenerative Cervical Myelopathy: Epidemiology, Genetics, and Pathogenesis. Spine. 2015.
  • Tetreault L, et al. The Modified Japanese Orthopaedic Association Scale: Establishing Criteria for Mild, Moderate and Severe Impairment in Patients with Degenerative Cervical Myelopathy. European Spine Journal. 2017.
  • Kadanka Z, et al. Predictors of symptomatic myelopathy in degenerative cervical spinal cord compression. Brain and Behavior. 2017.

© eSpine.com — For educational purposes only. This article does not constitute medical advice.