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Related Experiment Videos

A biomechanical analysis of C2 corpectomy constructs.

Christian M Puttlitz1, Juergen Harms, Zheng Xu

  • 1Department of Mechanical Engineering, Colorado State University, 1374 Campus Delivery, Fort Collins, CO 80523-1374, USA. puttlitz@engr.colostate.edu

The Spine Journal : Official Journal of the North American Spine Society
|February 27, 2007
PubMed
Summary

A novel C2 cage/plate prosthesis and traditional strut graft constructs both enhance stability after C2 corpectomy. Biomechanical testing revealed differences in stability based on fixation type and occiput inclusion.

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Area of Science:

  • Spinal surgery
  • Biomechanical engineering
  • Orthopedic research

Background:

  • Reconstructing the C2 vertebra after tumor resection is challenging.
  • Traditional methods involve strut grafts with plate or screw fixation.
  • A novel C2 prosthesis (cage/plate construct) has shown clinical success.

Purpose of the Study:

  • To compare the biomechanical stability of a novel C2 cage/plate construct against a conventional strut graft and plate construct.
  • To evaluate stability under various loading conditions in a cadaveric model.

Main Methods:

  • In vitro biomechanical study using seven fresh-frozen human cadaveric spines (C0-C5).
  • Testing of intact spines, followed by cage/plate and strut graft/plate constructs with C0-C3 or C1-C3 posterior instrumentation.

Related Experiment Videos

  • Application of pure moment loads and evaluation of motion using a three-camera system.

    • Main Results:

    • Both constructs significantly reduced motion compared to the intact state.
    • No significant difference in lateral bending stability between constructs, irrespective of occiput inclusion.
    • Flexion-extension and axial rotation stability varied based on anterior reconstruction and posterior fixation.

    Conclusions:

    • Both C2 cage/plate and strut graft/plate constructs offer initial stability in C2 corpectomy models.
    • Occiput inclusion in posterior instrumentation may not be necessary for equivalent C1-C3 stability in certain reconstructions.