Cervical Spondylotic Myelopathy (CSM): Clinical Guide

Table of Contents

• 1. What is Cervical Myelopathy?
• 2. Pathophysiology: Cord Compression
• 3. Signs and Symptoms (The Clumsy Hand)
• 4. Nurick Classification
• 5. Clinical Exams & Special Tests
• 6. Imaging & Diagnosis
• 7. Management: Conservative vs. Surgical
• 8. Physiotherapy Role
• 9. Frequently Asked Questions (FAQ)
• 10. References

1. What is Cervical Myelopathy?

Cervical Spondylotic Myelopathy (CSM) is the most common cause of spinal cord dysfunction in adults worldwide. Unlike radiculopathy, which involves a pinched nerve root, myelopathy is a clinical syndrome caused by the compression of the spinal cord itself within the cervical spine. It is a progressive degenerative condition that requires early detection to prevent permanent neurological deficit.

2. Pathophysiology: Cord Compression

The spinal cord becomes compressed due to age-related changes in the cervical spine, including:

• Disc Herniations: Bulging discs pushing backward into the spinal canal.
• Osteophytosis: Bone spurs growing from the vertebral bodies.
• Ligamentum Flavum Hypertrophy: Thickening of the ligaments inside the canal.
• OPLL: Ossification of the posterior longitudinal ligament.

This mechanical compression, combined with ischemia (reduced blood flow to the cord), leads to the death of neurons and white matter tracts.

3. Signs and Symptoms

The onset is often insidious, meaning symptoms appear so slowly that patients may attribute them to "getting older."

• Upper Limb: Loss of fine motor skills (difficulty buttoning shirts, handwriting changes, dropping items). This is often called the "Myelopathic Hand."
• Lower Limb: Gait instability, a "heavy" feeling in the legs, or feeling like you are walking on cotton wool.
• Balance Issues: Frequent tripping or needing to hold onto walls while walking.
• Bladder/Bowel: Urinary urgency or frequency (late-stage sign).

4. Nurick Classification

Clinicians use the Nurick scale to grade the severity of myelopathy based on gait:

Grade	Description
Grade 0	Signs of cord compression but no gait abnormality.
Grade I	Signs of gait abnormality but can work normally.
Grade II	Gait abnormality prevents full-time employment.
Grade III	Gait abnormality requires assistance for walking.
Grade IV	Able to walk only with a frame or crutches.
Grade V	Chair-bound or bedridden.

5. Clinical Exams & Special Tests

Upper Motor Neuron (UMN) signs are the hallmark of myelopathy:

• Hoffmann’s Sign: Flicking the nail of the middle finger causes the thumb and index finger to flex involuntarily.
• Babinski Sign: Stroking the sole of the foot causes the big toe to extend upward.
• Hyperreflexia: Overactive deep tendon reflexes (3+ or 4+).
• Inverted Supinator Reflex: Tapping the brachioradialis causes finger flexion instead of forearm supination.
• Gait Analysis: Observing for a "spastic" or "wide-based" gait.

7. Management: Conservative vs. Surgical

The management of CSM depends on the severity and rate of progression:

• Conservative: Only for very mild, non-progressive cases. Includes cervical bracing (short-term), activity modification, and physiotherapy.
• Surgical: Generally the treatment of choice for moderate to severe cases. Procedures like ACDF (Anterior Cervical Discectomy and Fusion) or Laminectomy aim to decompress the spinal cord. Surgery is often more about "stopping the progression" than "reversing the damage."

8. Physiotherapy Role

Physiotherapy cannot reverse spinal cord compression, but it is vital for functional maintenance:

• Balance Training: Perturbation training and vestibular exercises to reduce fall risk.
• Proprioception: Retraining the brain to recognize where the limbs are in space.
• Post-Surgical Rehab: Strengthening the deep neck flexors and stabilizers after fusion surgery.
• Pain Management: Addressing the compensatory muscle tension in the shoulders and upper back.

9. Frequently Asked Questions (FAQ)

Is Cervical Myelopathy permanent?

If the cord is compressed for a long time, the damage can be permanent. However, early decompression surgery can stop further damage and, in some cases, allow for partial recovery of function.

How is it different from a "pinched nerve"?

A pinched nerve (radiculopathy) usually causes pain/numbness in a specific arm pattern. Myelopathy affects the whole cord, leading to balance issues and bilateral (both sides) hand clumsiness.

10. References

• Fehlings MG, et al. A Clinical Care Guideline for the Management of Patients with Cervical Spondylotic Myelopathy. Spine.
• Nurick S. The pathogenesis of the spinal cord disorder associated with cervical spondylosis. Brain.
• Cook C, et al. Clustered clinical findings for diagnosis of cervical spine myelopathy. JMMT.

Disclaimer: Cervical Myelopathy is a serious neurological condition. If you experience sudden loss of balance or bowel/bladder control, seek immediate medical attention.