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Related Experiment Videos

Anterior spinal fixators. A biomechanical in vitro study

T A Zdeblick1, K E Warden, D Zou

  • 1Division of Orthopedic Surgery, University of Wisconsin, Madison.

Spine
|March 15, 1993
PubMed
Summary

The Kaneda and TSRH devices effectively restore lumbar spine stability after corpectomy. The Kaneda device provided significant torsional stability, while both Kaneda and TSRH constructs offered superior stiffness in axial loading and flexion.

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Area of Science:

  • Orthopedic Surgery
  • Biomechanical Engineering
  • Spinal Fusion Research

Background:

  • Vertebral body corpectomy is a surgical procedure to remove a vertebral body, often necessitating spinal stabilization.
  • Anterior spinal fixation devices are crucial for restoring stability after such extensive resections.

Purpose of the Study:

  • To compare the biomechanical stability of four anterior spinal fixation devices after corpectomy in a calf spine model.
  • To evaluate the effectiveness of these devices in restoring axial stiffness, torsional stiffness, and flexural strain.

Main Methods:

  • In vitro biomechanical testing of calf spines with a corpectomy and anterior iliac crest bone graft.
  • Sequential testing of four anterior spinal fixation constructs: Contoured Anterior Spinal Plate (CASP), Kaneda device, Kostuik-Harrington (KH) device, and Texas Scottish Rite Hospital (TSRH) vertebral body screw construct.

Related Experiment Videos

  • Measurement of axial stiffness, torsional stiffness, and flexural strain under simulated physiological loads (flexion, rotation, axial load).

    • Main Results:

    • The Kaneda device restored spinal stability in torsion to that of an intact spine.
    • The Kostuik-Harrington device demonstrated instability in torsion.
    • In axial loading and flexion, the Kaneda device and TSRH construct exhibited the highest stiffness.
    • The KH and CASP systems showed significantly lower stiffness compared to Kaneda and TSRH.

    Conclusions:

    • The Kaneda device and TSRH vertebral body screw construct are effective in restoring acute stability to the lumbar spine post-corpectomy.
    • These devices offer superior biomechanical performance in terms of stiffness and stability compared to the CASP and KH systems in this model.