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Bone density optimized pedicle screw insertion.

Christos Tsagkaris1, Anna-Katharina Calek1,2, Marie-Rosa Fasser2,3

  • 1Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland.

Frontiers in Bioengineering and Biotechnology
|November 13, 2023
PubMed
Summary
This summary is machine-generated.

Optimizing pedicle screw trajectory improves pull-out strength in vertebrae with high bone elastic modulus (E-modulus). This method may not benefit vertebrae with lower E-modulus, potentially due to reduced screw length.

Keywords:
pedicle screwspinespine biomechanicssurgical planningtrajectory

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Area of Science:

  • Orthopedic Surgery
  • Biomechanical Engineering
  • Spinal Fusion Techniques

Background:

  • Degenerative spinal disease is commonly treated with spinal fusion.
  • Screw loosening is a frequent complication, leading to pseudoarthrosis and revision surgery.
  • Optimizing pedicle screw trajectory can enhance implant resistance to mechanical loading.

Purpose of the Study:

  • To biomechanically verify an optimization algorithm for pedicle screw placement.
  • To quantify the effect of optimized screw trajectories on pull-out strength.
  • To compare the pull-out strength of optimized versus traditional screw trajectories in cadaveric specimens.

Main Methods:

  • Twenty-five lumbar vertebrae were used in a cadaveric study.
  • Pedicle screws were inserted using both traditional and optimized trajectories on contralateral sides.
  • Pull-out strength and strain energy were measured for each screw type.

Main Results:

  • Optimized trajectories showed improved pull-out strength and strain energy only in vertebrae with E-modulus > 3500 MPa cm³.
  • No significant benefit was observed for E-modulus values ≤ 3500 MPa cm³.
  • Optimized pedicle screws were significantly shorter than traditionally inserted screws (p < 0.001).

Conclusions:

  • Pedicle screw trajectory optimization is feasible but primarily beneficial for vertebrae with very high E-modulus.
  • Reduced screw length in optimized trajectories may decrease the implant-bone interface, limiting stability.
  • Future optimization models should incorporate screw length as a critical factor for predicting stability.