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Related Experiment Videos

In vitro load measurement using an instrumented spinal fixation device

A Rohlmann1, L H Riley, G Bergmann

  • 1Biomechanics Laboratory, Orthopaedic Hospital, Free University of Berlin, Germany.

Medical Engineering & Physics
|September 1, 1996
PubMed
Summary

This study modified an internal spinal fixator to assess corpectomy effects. Results show a significant increase in bending moments after corpectomy, particularly during flexion, impacting spinal implant performance.

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Area of Science:

  • Spinal surgery
  • Biomechanical engineering
  • Orthopedic implants

Background:

  • Internal spinal fixators are crucial for spinal stability.
  • Corpectomy, a significant spinal procedure, can alter biomechanical loads.
  • Understanding implant performance post-corpectomy is vital for patient outcomes.

Purpose of the Study:

  • To evaluate the biomechanical performance of a modified internal spinal fixator after corpectomy.
  • To quantify changes in forces and moments experienced by the implant under various loading conditions.

Main Methods:

  • An AO internal spinal fixator was modified with integrated strain gauges and telemetry.
  • Five cadaveric lumbar spines were instrumented with the modified implant.
  • Implant forces and moments were measured in intact spines, post-corpectomy, and post-corpectomy with ligamentous injury.

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Main Results:

  • Corpectomy significantly increased bending moments in the spinal implant across all tested modes.
  • Flexion bending moment showed the most substantial increase, rising from 155 Nmm to 3328 Nmm.
  • Axial compression, torsion, extension, and lateral bending also demonstrated increased forces and moments.

Conclusions:

  • Corpectomy substantially alters the biomechanical environment around spinal implants.
  • The modified internal spinal fixator effectively measured these load changes.
  • Findings highlight the need to consider altered biomechanics in spinal reconstruction following corpectomy.