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Related Experiment Videos

Sheep lumbar intervertebral discs as models for human discs.

J E Reid1, J R Meakin, S P Robins

  • 1Department of Bio-Medical Physics & Bio-Engineering, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, Scotland, UK.

Clinical Biomechanics (Bristol, Avon)
|May 30, 2002
PubMed
Summary

Sheep lumbar discs show varying water and collagen content, with collagen fiber angles changing across regions. These findings support sheep discs as a model for human intervertebral disc research.

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Area of Science:

  • Biomaterials Science
  • Orthopedic Research
  • Spinal Biomechanics

Background:

  • Sheep lumbar intervertebral discs are utilized in research to model human disc conditions.
  • Understanding the compositional and structural properties of sheep discs is crucial for validating their use as a human model.

Purpose of the Study:

  • To quantify water content, collagen content, and collagen fiber orientation in distinct regions of sheep lumbar discs.
  • To assess the suitability of sheep lumbar discs as a model for human intervertebral discs.

Main Methods:

  • Laboratory analysis of 21 sheep lumbar discs obtained from an abattoir.
  • Water content determined by oven drying.
  • Collagen content measured via hydroxyproline analysis.
  • Collagen fiber orientation angles analyzed using X-ray diffraction.

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Main Results:

  • Water content increased from the outer annulus (74%) to the nucleus (86%).
  • Collagen content decreased from the outer annulus (30%) to the posterior annulus (16%).
  • Collagen fiber orientation angles decreased from the outer annulus (59°) to the posterior annulus (51°).

Conclusions:

  • Sheep lumbar intervertebral discs exhibit compositional and structural gradients similar to human discs.
  • These findings validate the use of sheep lumbar discs as a relevant model for human intervertebral disc studies.
  • The data provides insights into material properties relevant for intervertebral disc implant development.