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Intervertebral Discs: Structure, Function and Disorders

Intervertebral discs are cartilage-like cushions located between the vertebrae of the spine. They absorb shock, enable movement, and protect spinal nerves.

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Things worth knowing about "Intervertebral Discs"

Intervertebral discs are cartilage-like cushions located between the vertebrae of the spine. They absorb shock, enable movement, and protect spinal nerves.

What Are Intervertebral Discs?

Intervertebral discs are flat, fibrocartilaginous structures situated between each pair of adjacent vertebral bodies along the spinal column. The human spine contains 23 intervertebral discs in total. They serve essential biomechanical functions: acting as shock absorbers, enabling spinal mobility, and protecting the spinal cord and nerve roots from pressure and injury.

Structure of the Intervertebral Disc

Each intervertebral disc is composed of two main components:

Nucleus pulposus (gel core): The soft, gel-like inner core consists primarily of water and proteoglycans. It absorbs compressive forces and distributes pressure evenly across the disc.
Anulus fibrosus (fibrous ring): The outer ring, made up of concentric layers of collagen fibers, encases the nucleus pulposus and provides structural stability.

In children and adolescents, intervertebral discs are supplied by blood vessels. From early adulthood onward, nutrient supply relies exclusively on diffusion from adjacent vertebral bodies, which increases susceptibility to degeneration over time.

Functions of the Intervertebral Discs

Absorbing impact and compressive forces during walking, running, and lifting
Enabling flexion, extension, and rotational movements of the spine
Maintaining the space between vertebral bodies to protect nerve roots
Distributing mechanical load evenly across the vertebral endplates

Common Disorders of the Intervertebral Discs

Disc Degeneration

With advancing age, the nucleus pulposus loses water content and elasticity. The disc becomes thinner and less resilient. This natural aging process, known as intervertebral disc degeneration or osteochondrosis, can lead to chronic back pain and reduced spinal function.

Disc Herniation (Prolapsed Disc)

A disc herniation (also called a slipped disc or nucleus pulposus prolapse) occurs when the gel core pushes through a tear in the fibrous ring and compresses adjacent nerves or the spinal cord. Typical symptoms include:

Severe, often one-sided back or neck pain
Radiating pain into the arms or legs (e.g., sciatica)
Numbness, tingling, or muscle weakness in the affected limbs

Disc Protrusion (Bulging Disc)

A disc protrusion occurs when the disc bulges outward without a complete tear of the fibrous ring. This precursor stage to a full herniation can also cause pain and neurological symptoms.

Diagnosis of Disc Disorders

Diagnosis is typically established through a combination of:

Clinical examination: Assessment of mobility, reflexes, and neurological deficits
Magnetic Resonance Imaging (MRI): The gold standard for visualizing discs, nerve structures, and soft tissues
Computed Tomography (CT): Supplementary imaging, particularly useful for evaluating bony structures
X-ray: Used to assess vertebral changes and disc height reduction

Treatment of Intervertebral Disc Disorders

Conservative Treatment

The majority of disc disorders can be successfully managed without surgery:

Physiotherapy and exercise therapy: Strengthening of back and abdominal muscles to relieve spinal load
Pain management: Use of analgesics (e.g., ibuprofen, diclofenac) and muscle relaxants
Heat or cold therapy: To relieve muscle tension and alleviate pain
Injection therapy: Targeted infiltrations with local anesthetics or corticosteroids near affected nerve roots

Surgical Treatment

Surgery is required in only a minority of cases, primarily when:

Persistent, treatment-resistant pain despite conservative management
Severe neurological deficits are present (e.g., paralysis, bladder or bowel dysfunction)
Cauda equina syndrome occurs (a medical emergency)

Surgical options include microdiscectomy, endoscopic disc surgery, and for severe degeneration, disc arthroplasty (artificial disc replacement) or spinal fusion.

Prevention of Disc Disorders

Regular physical activity and targeted back-strengthening exercises
Ergonomic design of the workplace and daily environment
Using proper body mechanics when lifting and carrying heavy objects
Maintaining a healthy body weight to reduce spinal load
Adequate fluid intake to maintain disc hydration

References

Bogduk, N. - Clinical and Radiological Anatomy of the Lumbar Spine. 5th ed. Churchill Livingstone, 2012.
Deyo, R. A. and Weinstein, J. N. - Low Back Pain. New England Journal of Medicine, 344(5): 363-370, 2001.
World Health Organization (WHO) - Musculoskeletal conditions. Fact Sheet. Geneva: WHO, 2023. Available at: https://www.who.int/news-room/fact-sheets/detail/musculoskeletal-conditions

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