Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
권호 표지

Change in Kinematics of the Spine after Insertion of an Interspinous Spacer for the Treatment of the Lumbar Spinal Stenosis

  • Lee H. S. (Department of Biomedical Engineering, Inje University) ;
  • Moon S. J. (Department of Biomedical Engineering, Inje University) ;
  • Kwon S. Y. (Department of Biomedical Engineering, Inje University) ;
  • Jung T. G. (Department of Biomedical Engineering, Inje University) ;
  • Shin K. C. (Cheil Orthopaedic Hospital) ;
  • Lee K. Y. (Department of Mechanical Engineering, Sejong, University) ;
  • Lee S. J. (Department of Biomedical Engineering, Inje University)
  • Published : 2005.06.01
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Abstract

Interspinous spacers have been developed as an alternative surgical treatment for laminectomy or fusion with pedicle screws and rods for the treatment of lumbar spinal stenosis. However, its biomedical efficacies are well not known. In this study, we evaluated kinematic behaviors of the surgical and the adjacent levels before and after inserting interspinous spacers. Three porcine lumbar spines were prepared. On each specimen, an interspinous spacer was inserted at the L4-L5. Flexion-extension moments (0, 2.5, 5.0, 7.5, 10Nm) were applied. A stereophotogrammetric set-up with DLT algorithm was used to assess the three-dimensional motions of the specimen where three markers $({\square}0.8mm)$ were attached to each vertebra. Results showed that extension motion decreased by $15-24\%$ at the surgical level (L4-L5) after insertion of interspinous spacer. At the adjacent levels, the range of motion remained unchanged. In flexion, no significant changes in motion were observed regardless of levels. Therefore, our experimental results demonstrated the interspinous spacer is very effective in limiting the extension motion that may cause narrowing of the spinal canal and vertebral foramen while maintaining kinematic behaviors at the adjacent levels. Further, these results suggested that the use of interspinous spacer may be able to prevent lower back pain at the surgical level and to lower the incidence of degenerative changes at the adjacent levels.

Keywords

References

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