Disc Herniation: Definition and Clinical Context

What Is a Disc Herniation?

A disc herniation (also called a herniated disc, slipped disc, or ruptured disc) occurs when the inner gel-like material of an intervertebral disc — the nucleus pulposus — pushes through a tear or weakness in the disc's outer fibrous layer, the annulus fibrosus.

The intervertebral disc functions as a shock absorber and spacer between the vertebrae. When healthy, it distributes spinal loads evenly and allows fluid movement. When herniated, the displaced nucleus material can press against the spinal cord or adjacent nerve roots — causing a range of symptoms from localized back pain to sharp radiating pain, numbness, and weakness in the extremities.

Anatomy of a Disc: Understanding What Herniates

Each intervertebral disc consists of:

• Annulus fibrosus: The tough outer ring, composed of 15–25 concentric layers of collagen fibers arranged in alternating diagonal patterns. It provides structural integrity and contains the nucleus.
• Nucleus pulposus: The gel-like inner core, composed primarily of water and proteoglycan proteins. It provides hydraulic shock absorption.

With age and repetitive loading, the annulus fibers can weaken or develop tears. A sudden physical stress — a lift, a twist, a fall — can cause the nucleus to push through these tears.

Herniation vs. Bulge vs. Protrusion

These terms are often used interchangeably but have specific meanings on MRI reports:

• Disc bulge: The outer ring weakens and the disc extends beyond its normal margins in all directions — like a compressed burger patty spreading outward. The nucleus has not broken through.
• Disc protrusion: The nucleus extends asymmetrically through part of the annulus but the outer layers are still intact
• Disc extrusion (herniation): The nucleus material breaks through the outer annulus into the spinal canal
• Disc sequestration: A fragment of nucleus material separates entirely and becomes free within the spinal canal

Common Symptoms of a Herniated Disc

Symptoms depend on the location and degree of nerve compression:

Lumbar (lower back) herniation:

• Localized low back pain
• Sciatica — sharp, burning, or shooting pain radiating down the leg
• Numbness or tingling in the leg, foot, or toes
• Muscle weakness in the leg

Cervical (neck) herniation:

• Neck pain, often with headache
• Radiating pain, numbness, or tingling into the shoulder, arm, or hand
• Grip weakness

Non-Surgical Treatment at McNamara Chiropractic Center

The majority of disc herniations resolve or become manageable with appropriate conservative care. Surgical discectomy or fusion is typically considered only after a course of conservative treatment has been exhausted.

At McNamara Chiropractic Center, disc herniations are treated with our Spinal Decompression Program — combining Antalgic-Trac decompression (which reduces intradiscal pressure and promotes herniation retraction), Class IV Laser Therapy (which reduces inflammation and accelerates tissue repair), and Shockwave Therapy.

Learn more about Spinal Decompression at McNamara or explore our comprehensive Back Pain Guide.

---

McNamara Chiropractic Center | 3320 N. Federal Highway, Suite 101, Lighthouse Point, FL 33064 | (954) 943-1100