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[Radiological study on rat lumbar vertebral semidislocation model].

Bo Chen1, Xun Lin1, Min Zhang1

  • 11.Shi's Center of Orthopedics and Traumatology, Shuguang Hospital Affiliated to Shanghai University of TCM, Shanghai 201203, China; 2.Institute of Traumatology & Orthopedics, Shanghai Academy of TCM, Shanghai 201203, China.

Zhejiang Da Xue Xue Bao. Yi Xue Ban = Journal of Zhejiang University. Medical Sciences
|June 4, 2015
PubMed
Summary
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Lumbar fixation in rats reduced intervertebral space and caused osteophyte formation. These findings highlight potential complications of spinal fixation procedures in animal models.

Area of Science:

  • Spinal Biomechanics
  • Surgical Innovation
  • Animal Models in Research

Background:

  • Spinal fixation is a common surgical procedure.
  • Understanding the biomechanical consequences of fixation is crucial.
  • Radiographic assessment provides quantitative data on spinal changes.

Purpose of the Study:

  • To investigate the radiographic impact of lumbar segment fixation in a rat model.
  • To compare simple fixation (SF) versus rotary fixation (RF) on spinal parameters.
  • To evaluate changes in intervertebral space and spinous process distance post-fixation.

Main Methods:

  • 120 male Sprague-Dawley rats were divided into SF, RF, and sham groups.
  • An external fixation system was applied to L4-L6 in SF and RF groups.

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  • Radiographic measurements of intervertebral and spinous process distances were taken at 1, 4, 8, and 12 weeks.

    • Main Results:

    • Both SF and RF groups showed significant decreases in intervertebral space and spinous process distance compared to the sham group.
    • These reductions were consistently observed at 4, 8, and 12 weeks post-fixation.
    • Osteophyte formation was evident in both fixation groups by 8 weeks.

    Conclusions:

    • Lumbar segment fixation in rats leads to reduced intervertebral disc space.
    • Spinal fixation can induce osteophyte formation, a potential adverse effect.
    • Radiographic analysis is effective in quantifying these post-fixation spinal changes.