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Degenerative Disc Disease I: Introduction

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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: Pathophysiology

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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...

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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...

Bone Disorders

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Related Experiment Video

Updated: Jun 16, 2026

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

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

Published on: July 8, 2021

Quantitative differences in intervertebral disc-matrix composition with age-related degeneration.

Hideki Murakami¹, Tim S Yoon, Emad S Attallah-Wasif

¹Department of Orthopaedic Surgery, Iwate Medical University School of Medicine, Morioka, Japan.

Medical & Biological Engineering & Computing

|February 13, 2010

Summary

Aging significantly impacts the intervertebral disc, particularly the nucleus pulposus. Young rabbits showed higher water, proteoglycan, DNA, and aggrecan/type II collagen mRNA levels than older rabbits.

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Last Updated: Jun 16, 2026

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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Ovine Lumbar Intervertebral Disc Degeneration Model Utilizing a Lateral Retroperitoneal Drill Bit Injury

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Published on: May 25, 2017

Area of Science:

Biomedical Science
Orthopedics
Aging Research

Background:

Intervertebral disc degeneration is a significant health issue associated with aging.
Understanding age-related changes at a molecular and cellular level is crucial for developing effective treatments.

Purpose of the Study:

To investigate the effects of aging on the intervertebral disc (IVD) using a rabbit model.
To compare the biochemical and molecular composition of the nucleus pulposus and anulus fibrosus in young versus old rabbits.

Main Methods:

Tissue samples from the nucleus pulposus and anulus fibrosus were collected from young (6-month-old) and old (3-year-old) New Zealand white rabbits.
Measurements included water content, proteoglycan content, DNA content, and mRNA levels of aggrecan, type I collagen, and type II collagen.

Main Results:

The nucleus pulposus of young rabbits exhibited significantly higher water, proteoglycan, DNA, and mRNA levels for aggrecan and type II collagen compared to old rabbits.
In the anulus fibrosus, only proteoglycan and DNA content were significantly higher in young rabbits compared to old rabbits.
These findings indicate that the nucleus pulposus is more profoundly affected by aging than the anulus fibrosus.

Conclusions:

Aging leads to substantial biochemical and molecular alterations in the intervertebral disc.
The nucleus pulposus is the primary site of age-related changes within the intervertebral disc.
This rabbit model provides valuable insights into the mechanisms of disc degeneration.