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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...
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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...

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Related Experiment Video

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Multilevel Oblique Lumbar Interbody Fusion in Degenerative Lumbar Disc Disease with Instability
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Modified Pfirrmann grading system for lumbar intervertebral disc degeneration.

James F Griffith1, Yi-Xiang J Wang, Gregory E Antonio

  • 1Department of Diagnostic Radiology and Organ Imaging, Prince of Wales Hospital, Chinese University of Hong Kong, Shatin, NT, Hong Kong. griffith@cuhk.edu.hk

Spine
|November 17, 2007
PubMed
Summary

A modified 8-level grading system effectively assesses lumbar disc degeneration in older adults. This revised Pfirrmann scale demonstrates good reliability for both individual readers and between different readers, aiding in severity discrimination.

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Area of Science:

  • Orthopedics
  • Radiology
  • Geriatric Medicine

Background:

  • The standard 5-level Pfirrmann grading system lacks discriminatory power for lumbar disc degeneration in elderly populations.
  • Accurate assessment of disc degeneration severity is crucial for understanding its association with other health variables.

Purpose of the Study:

  • To modify the existing Pfirrmann grading system for lumbar disc degeneration.
  • To evaluate the reliability of the newly developed 8-level grading system in elderly subjects.

Main Methods:

  • An 8-level grading system was developed with detailed grade descriptions and a reference image panel.
  • The system's reliability was tested on 260 lumbar intervertebral discs from 52 elderly individuals (mean age 73 years).
  • Three independent readers assessed discs, with intraobserver and interobserver reliability calculated using weighted kappa statistics.

Main Results:

  • The modified system classified discs into grades 3 through 8, with significant percentages in grades 3-6.
  • Excellent intraobserver agreement (weighted kappa: 0.79-0.91) and substantial interobserver agreement (weighted kappa: 0.65-0.67) were achieved.
  • High rates of complete agreement (85% intraobserver, 66% interobserver) were observed, with most disagreements differing by only one grade.

Conclusions:

  • The modified 8-level Pfirrmann grading system effectively discriminates the severity of lumbar disc degeneration in elderly individuals.
  • The revised system demonstrates good intra- and interobserver reliability, making it a valuable clinical tool.