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Neurological Conditions

Cervical Disc Herniation

Cervical Disc Herniation · M50.1

Cervical disc herniation is a condition in which the nucleus pulposus of a cervical intervertebral disc protrudes through the annulus fibrosus, compressing adjacent nerve roots or the spinal cord and causing pain and neurological symptoms.

2026-03-29

At a Glance

Cervical disc herniation, commonly referred to as a "neck disc," most frequently occurs at the C5-6 and C6-7 levels [1]. It primarily affects the working-age population in their 30s to 50s, with characteristic neck pain and upper extremity radicular pain. Approximately 80-90% of patients improve with conservative treatment (medication, physical therapy), and surgery is considered when progressive weakness or myelopathy is present [2]. Asymptomatic disc protrusions are very common, so imaging findings alone should not guide treatment decisions.

Definition and Overview

Cervical disc herniation is a condition in which the nucleus pulposus of a cervical intervertebral disc protrudes through the annulus fibrosus, weakened by degenerative changes or external forces, mechanically compressing adjacent nerve roots or the spinal cord and inducing chemical inflammation.

The C5-6 and C6-7 levels account for approximately 70-75% of all cervical disc herniations, due to the greater range of motion at these segments [1]. It is most common in the 30-50 age group and approximately 1.5 times more frequent in men.

Pathophysiology

Disc Degeneration

Cervical disc degeneration begins in the late 20s. As the water content of the nucleus pulposus decreases and proteoglycans degenerate, the disc's shock-absorbing capacity diminishes. Accumulation of annular tears creates pathways through which the nucleus pulposus can protrude.

Types of Disc Herniation

  • Bulging: The annulus fibrosus bulges diffusely but the nucleus pulposus remains contained within the annulus
  • Protrusion: The nucleus pulposus pushes through part of the annulus but does not extend beyond the posterior longitudinal ligament
  • Extrusion: The nucleus pulposus completely penetrates the annulus fibrosus
  • Sequestration: A fragment of extruded nucleus pulposus separates from the parent disc

Mechanism of Nerve Injury

Ischemic damage from mechanical compression and chemical radiculitis from inflammatory mediators such as phospholipase A2 and TNF-alpha released from the nucleus pulposus act simultaneously. For this reason, the degree of disc protrusion on imaging does not always correlate with symptom severity.

Symptoms

Neck Pain

Most patients experience midline or unilateral neck pain, which may radiate to the interscapular region. Pain is aggravated by neck movement, particularly extension and rotation toward the affected side.

Upper Extremity Radicular Pain

When the disc compresses a nerve root, sharp pain radiates along the corresponding dermatome from the shoulder, down the arm, to the hand.

  • C5-6 herniation (C6 nerve root): Thumb and index finger numbness, wrist extension weakness
  • C6-7 herniation (C7 nerve root): Middle finger numbness, triceps weakness
  • C7-T1 herniation (C8 nerve root): Ring and little finger numbness, grip weakness

Myelopathy

Large central herniations can compress the spinal cord, causing myelopathy. Characteristic findings include bilateral fine motor impairment of the hands, gait instability, lower extremity spasticity, and bladder dysfunction. Surgical decompression is required due to the risk of irreversible damage [5].

Diagnosis

Imaging Studies

  • Cervical MRI: The standard examination for evaluating soft tissues (disc, nerve roots, spinal cord). Herniated disc and nerve root compression can be directly visualized on T2-weighted images.
  • Cervical X-ray: Identifies indirect findings such as disc height loss, osteophytes, and alignment abnormalities
  • CT myelography: Used as an alternative when MRI is contraindicated (e.g., pacemaker)

Frequency of Asymptomatic Disc Abnormalities

In a study by Boden et al., cervical disc abnormalities were found on MRI in approximately 19% (under 40 years) to 57% (over 60 years) of asymptomatic adults [3]. Therefore, surgical decisions should not be based on imaging findings alone, and correlation with clinical symptoms must be confirmed.

Electrodiagnostic Studies

Nerve conduction studies and electromyography are useful for objective confirmation of radiculopathy, determination of the affected level, and differentiation from peripheral nerve entrapment (such as carpal tunnel syndrome).

Treatment

Conservative Treatment

Conservative treatment is the first-line therapy for cervical disc herniation. Approximately 80-90% of patients improve with conservative treatment alone [2].

  • Pharmacotherapy: NSAIDs (initial pain control), muscle relaxants (cervical muscle spasm), gabapentin or pregabalin (neuropathic pain)
  • Physical therapy: Cervical traction after the acute phase, manual therapy, neck strengthening exercises
  • Cervical brace: Short-term use (1-2 weeks) during the acute phase; prolonged use may cause muscle atrophy
  • Epidural steroid injection: Considered when there is no improvement after 4-6 weeks of conservative treatment

Surgical Treatment

Surgery is considered in the following cases:

  • No meaningful improvement after 6-12 weeks of conservative treatment
  • Progressive muscle weakness (strength grade 3 or below)
  • Signs of myelopathy (gait disturbance, fine motor impairment of the hands, bladder dysfunction)
  • Severe pain significantly limiting daily function

The main surgical methods are as follows:

  • Anterior cervical discectomy and fusion (ACDF): The most common surgical procedure, involving anterior approach to remove the herniated disc and fuse the adjacent vertebral bodies.
  • Artificial disc replacement: Preserves the motion segment and has the advantage of reducing adjacent segment degeneration risk.
  • Posterior foraminotomy: Enables nerve root decompression without fusion, but has limited applicability.

Course and Prognosis

The prognosis is generally favorable. In the conservative treatment group, more than 90% of patients achieve functional recovery within 4-6 months. Long-term satisfaction is also high among surgically treated patients, with ACDF success rates reported at approximately 90-95%.

Adjacent segment disease occurs at a rate of approximately 2.9% per year following ACDF, with a 10-year cumulative incidence of approximately 25% [4]. Long-term data are accumulating on whether artificial disc replacement reduces this risk.

Lifestyle Guide

  • Maintain habitual postures that preserve the natural cervical lordosis.
  • Position computer monitors at eye level, and keyboards and mice at elbow height.
  • Avoid prolonged static postures and gently stretch the neck every 30-60 minutes.
  • Perform daily deep neck flexor strengthening exercises.
  • Use a pillow that is neither too high nor too low during sleep to keep the cervical spine in a neutral position.
  • Quit smoking: Smoking impairs nutrient supply to intervertebral discs and accelerates degeneration.

Frequently Asked Questions

Degenerative changes of the disc are the fundamental cause. As we age, the water content of the disc decreases and the annulus fibrosus weakens, making the nucleus pulposus more prone to protrusion. Prolonged static postures (computer work), repetitive neck movements, trauma, and smoking are contributing risk factors.

Not necessarily. Cervical disc abnormalities on MRI are found in approximately 19% (40s) to 57% (over 60s) of asymptomatic individuals, most of whom have no symptoms [3]. Surgery is only considered when there is no response to conservative treatment, progressive muscle weakness, or signs of myelopathy.

Spontaneous improvement occurs in a significant number of cases. In conservative treatment studies, 80-90% of patients showed symptom improvement within 12 weeks with medication, physical therapy, and activity modification alone [2]. Cases have also been reported where the protruded disc dehydrates and shrinks over time or is absorbed through immune-mediated responses.

If you experience fine motor difficulties in both hands (trouble buttoning shirts or using chopsticks), gait instability, lower extremity stiffness, or bladder/bowel dysfunction, myelopathy is suspected and immediate specialist evaluation is needed. Rapidly progressive muscle weakness also requires prompt assessment.

Position your monitor at eye level and avoid excessive forward head tilting when using a smartphone. Stretch your neck every 30-60 minutes and regularly perform deep neck flexor strengthening exercises. Use a pillow that maintains the natural cervical curvature during sleep. Smoking cessation helps slow disc degeneration.

References

  1. [1] Schoenfeld AJ, George AA, Bader JO, Caram PM Jr (2012). "Incidence and epidemiology of cervical radiculopathy in the United States military: 2000 to 2009." Journal of Spinal Disorders & Techniques, 25: 17-22. DOI PubMed
  2. [2] Saal JS, Saal JA, Yurth EF (1996). "Nonoperative management of herniated cervical intervertebral disc with radiculopathy." Spine, 21: 1877-1883. DOI PubMed
  3. [3] Boden SD, McCowin PR, Davis DO, Dina TS, Mark AS, Wiesel S (1990). "Abnormal magnetic-resonance scans of the cervical spine in asymptomatic subjects." Journal of Bone and Joint Surgery, 72: 1178-1184. DOI PubMed
  4. [4] Hilibrand AS, Carlson GD, Palumbo MA, Jones PK, Bohlman HH (1999). "Radiculopathy and myelopathy at segments adjacent to the site of a previous anterior cervical arthrodesis." Journal of Bone and Joint Surgery, 81: 519-528. DOI PubMed
  5. [5] Kadanka Z, Bednarík J, Novotný O, Urbánek I, Dusek L (2011). "Cervical spondylotic myelopathy: conservative versus surgical treatment after 10 years." European Spine Journal, 20: 1533-1538. DOI PubMed

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