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Related Concept Videos

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...
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 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...

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Related Experiment Video

Updated: Jun 24, 2026

An In Vitro Organ Culture Model of the Murine Intervertebral Disc
08:03

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Published on: April 11, 2017

Mechanical profiling of intervertebral discs.

David S Schultz1, Azucena G Rodriguez, Paul K Hansma

  • 1UCSF Department of Orthopaedic Surgery, UC Hall U, San Francisco, CA 94143-0565, USA. dschultz@newton.berkeley.edu

Journal of Biomechanics
|April 7, 2009
PubMed
Summary
This summary is machine-generated.

This study explored intervertebral disc mechanical properties and degeneration. Local tissue modulus correlated with microscopic lamellar striation clarity, not imaging grades, suggesting new diagnostic insights for discogenic back pain.

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Area of Science:

  • Biomedical Engineering
  • Orthopedics
  • Spinal Research

Background:

  • Discogenic back pain remains a significant clinical challenge despite advances in diagnostics and treatments.
  • Current methods struggle to link early degenerative changes in intervertebral discs to pain and dysfunction.
  • Understanding the mechanical properties of intervertebral discs is crucial for diagnosing and managing back pain.

Purpose of the Study:

  • To investigate the relationship between the mechanical properties of intervertebral discs and their radiological and histological characteristics.
  • To evaluate the utility of a novel tissue diagnostic instrument (TDI) for assessing disc mechanical integrity.
  • To explore potential correlations between mechanical profiles and degenerative patterns for improved diagnostic capabilities.

Main Methods:

  • Mechanical properties (local stiffness, strain energy absorption) of 13 intact intervertebral discs were measured using the tissue diagnostic instrument (TDI).
  • Discs were radiologically scored using the Pfirrmann scale based on MR images prior to mechanical testing.
  • Histological analysis, including polarized light microscopy, was performed on excised disc sections.

Main Results:

  • No significant correlations were found between the Pfirrmann grading and the measured mechanical properties of the discs.
  • Polarized light microscopy revealed correlations between the local tissue modulus measured by the TDI and the clarity and density of lamellar striations within the disc tissue.
  • These findings suggest that microscopic structural integrity, not macroscopic imaging grades, may be more closely related to mechanical behavior.

Conclusions:

  • The Pfirrmann grading scale may not accurately reflect the mechanical properties relevant to discogenic pain.
  • Microscopic structural features, such as lamellar striation clarity, show promise as indicators of disc mechanical integrity.
  • The TDI offers a potential tool for assessing disc mechanical properties, providing insights beyond traditional imaging for understanding disc degeneration and pain.