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Related Concept Videos

Herniated Intervertebral Disc l: Introduction01:29

Herniated Intervertebral Disc l: Introduction

Intervertebral disc herniation refers to the displacement of the nucleus pulposus (the gel-like inner core of the disc) through a tear or weakened area in the annulus fibrosus (the outer fibrous ring). The displaced disc material extends beyond the normal boundaries of the disc space and may compress or irritate nearby spinal nerve roots or, less commonly, the spinal cord.Etiology and Risk FactorsHerniation commonly results from degeneration, in which aging reduces disc hydration and...
Degenerative Disc Disease I: Introduction01:27

Degenerative Disc Disease I: Introduction

Degenerative disc disease is a chronic condition in which intervertebral discs gradually lose structure and function. It is not infectious or autoimmune; rather, it results from age-related biochemical and mechanical changes, influenced by genetic, metabolic, and environmental factors.Structure and Function of DiscsThe spine contains 23 intervertebral discs that absorb load, distribute forces, maintain spacing, and allow flexibility. Each disc consists of a nucleus pulposus, a gel-like core...
Degenerative Disc Disease ll: Pathophysiology01:23

Degenerative Disc Disease ll: Pathophysiology

The symptoms of degenerative disc disease arise from a combination of mechanical compression, vascular compromise, and biochemical inflammation, which together disrupt nerve function and produce pain.Mechanical CompressionDisc degeneration reduces height and elasticity, predisposing to herniation of the nucleus pulposus, a major cause of radicular pain. Herniations may be protrusion (bulging with intact annulus), extrusion (nucleus extends beyond disc but remains connected), or sequestration...
Structural Joints: Cartilaginous Joints01:17

Structural Joints: Cartilaginous Joints

As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
There are two types of cartilaginous joints:
Synchondrosis
A synchondrosis ("joined by cartilage") is a cartilaginous joint where bones are connected by hyaline cartilage. Synchondrosis may be temporary or...
General Structure of a Vertebra01:30

General Structure of a Vertebra

A typical vertebra, with the exception of the sacrum and coccyx, consists of a body, a vertebral arch, and seven different projections termed processes. The anterior portion of the vertebrae, the body, supports about half the body’s weight. The vertebral bodies progressively increase in size and thickness from the cervical region to the lumbar region of the vertebral column. The intervertebral discs present between the bodies of adjacent vertebrae firmly unites them, forming a continuous column.
Spinal Cord Injury ll: Pathophysiology01:14

Spinal Cord Injury ll: Pathophysiology

Spinal cord injury progresses through two interconnected phases: primary injury and secondary injury.Primary InjuryPrimary injury happens at the moment of trauma and involves immediate mechanical damage to the spinal cord.Compression happens when broken vertebrae, herniated discs, or accumulating blood (such as a hematoma) press directly against the spinal cord, distorting its normal shape and function. In cases of contusion, the cord is bruised by a blunt force (like penetrating injuries or...

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Explorative Study of Modulatory Effects of Notochordal Cell-Derived Extracellular Vesicles on the IL-1β-Induced Catabolic Cascade in Nucleus Pulposus Cell Pellets and Explants.

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Ex vivo intervertebral disc cultures: degeneration-induction methods and their implications for clinical translation.

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Correction: Shorter and sweeter: the 16-item version of the SRS questionnaire shows better structural validity than the 20-item version in young patients with spinal deformity.

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Shorter and sweeter: the 16-item version of the SRS questionnaire shows better structural validity than the 20-item version in young patients with spinal deformity.

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Related Experiment Video

Updated: May 9, 2026

Optical Sectioning and Visualization of the Intervertebral Disc from Embryonic Development to Degeneration
06:22

Optical Sectioning and Visualization of the Intervertebral Disc from Embryonic Development to Degeneration

Published on: July 8, 2021

Do intervertebral discs degenerate before they herniate, or after?

P Lama1, C L Le Maitre, P Dolan

  • 1University of Bristol, Centre for Comparative and Clinical Anatomy, Bristol, UK.

The Bone & Joint Journal
|August 3, 2013
PubMed
Summary

Intervertebral disc herniation is not always preceded by degeneration. Herniated discs show distinct annular changes like neovascularization and inflammation, suggesting these can be consequences, not causes, of herniation.

Keywords:
CausationDegenerationHerniationInflammationIntervertebral discSpine

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A Proinflammatory, Degenerative Organ Culture Model to Simulate Early-Stage Intervertebral Disc Disease.
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Optical Sectioning and Visualization of the Intervertebral Disc from Embryonic Development to Degeneration
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Published on: July 8, 2021

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Area of Science:

  • Orthopedics
  • Spinal Surgery
  • Histopathology

Background:

  • The prevailing clinical assumption is that intervertebral disc degeneration must occur before herniation.
  • This belief has significant clinical and medicolegal implications.
  • The scientific validity of this assumption is questioned.

Purpose of the Study:

  • To investigate whether tissue changes in herniated intervertebral discs differ from those in degenerated discs without herniation.
  • To challenge the traditional view that degeneration is a prerequisite for disc herniation.

Main Methods:

  • Surgical tissue samples from 21 herniated and 11 non-herniated discs (similar Pfirrmann degeneration grade) were analyzed.
  • Histological grading and quantification of specific features (proteoglycan loss, neovascularization, innervation, cellularity, inflammation, matrix-degrading enzymes) using immunofluorescence and confocal microscopy.
  • Comparison of tissue types: nucleus, inner annulus, and outer annulus.

Main Results:

  • Herniated discs exhibited significantly greater proteoglycan loss in the outer annulus, neovascularization, innervation, and inflammation in the annulus compared to degenerated discs.
  • Increased expression of matrix-degrading enzymes was observed in the inner annulus of herniated discs.
  • No significant differences were found in the nucleus pulposus between herniated and degenerated discs.

Conclusions:

  • The findings challenge the assumption that disc degeneration always precedes herniation, particularly given that degenerative changes typically initiate in the nucleus.
  • Specific annular changes in herniated discs (neovascularization, innervation, inflammation) are likely consequences of the herniation event itself.
  • This suggests a re-evaluation of the pathophysiology of intervertebral disc herniation is warranted.