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Related Experiment Videos

Intervertebral disc adaptation to wedging deformation.

Ian A F Stokes1, David D Aronsson, Katherine C Clark

  • 1University of Vermont, Orthopaedics and Rehabilitation, Burlington, Vermont, 05405-0084, USA.

Studies in Health Technology and Informatics
|November 17, 2006
PubMed
Summary

Mechanical forces remodel intervertebral discs in young rats with scoliosis within five weeks. This study demonstrates that induced scoliosis in rats is a suitable model for investigating adaptive disc wedging in humans.

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Metabolic Effects of Angulation, Compression, and Reduced Mobility on Annulus Fibrosis in a Model of Altered Mechanical Environment in Scoliosis.

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Area of Science:

  • Biomechanical Engineering
  • Developmental Biology
  • Orthopedics

Background:

  • Scoliosis involves vertebral and discal wedge deformities, but the causes of discal changes remain unclear.
  • The role of mechanical influences on intervertebral disc growth and remodeling in scoliosis is not well understood.

Purpose of the Study:

  • To investigate the remodeling capacity of intervertebral discs in response to mechanical deformity.
  • To establish a rat model for studying adaptive wedging in mechanically induced scoliosis.

Main Methods:

  • Young rats underwent mechanical compression and angulation of intervertebral discs using an external apparatus for 5 or 10 weeks.
  • In vivo micro-CT scanning documented disc wedging, and post-excision flexibility was measured.
  • Histological analysis using polarized light microscopy examined collagen fiber organization.

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Main Results:

  • Induced disc wedging deformity remodeled significantly within 5 weeks, with flexibility adapting to the deformed geometry.
  • Intervertebral discs showed structural remodeling, indicated by near-complete adaptation to the deformed geometry and no significant difference in collagen crimp angles between sides.
  • No significant difference in maximum flexibility was observed between 5- and 10-week groups.

Conclusions:

  • Mechanically induced scoliosis in skeletally immature rats leads to intervertebral disc remodeling within 5 weeks.
  • This animal model is effective for studying adaptive wedging changes characteristic of human scoliosis.