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Related Experiment Video

Updated: Aug 20, 2025

An Anesthesia, Surgery, and Harvest Method for the Evaluation of Transpedicular Screws Using an In Vivo Porcine Lumbar Spine Model
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A dynamic pedicle screw system using polyethylene insert for the lumbar spine.

Yasushi Oshima1, So Kato1, Toru Doi1

  • 1Department of Orthopaedic Surgery, The University of Tokyo Hospital, Tokyo, Japan.

Journal of Biomedical Materials Research. Part B, Applied Biomaterials
|November 19, 2022
PubMed
Summary

This study introduces a novel dynamic pedicle screw system with polyethylene inserts for spinal fusion. Results show reduced loosening and adjacent segment pathology, offering a promising alternative to rigid systems.

Keywords:
adjacent segmentlooseningmobileposterior stabilizationspinal fusion

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Last Updated: Aug 20, 2025

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Spinal Biomechanics

Background:

  • Rigid spinal fusion is effective for degenerative disorders but risks adjacent segment pathology and implant loosening.
  • Novel stabilization methods are needed to mitigate complications associated with rigid spinal fusion.

Purpose of the Study:

  • To evaluate a novel posterior stabilization system using dynamic pedicle screws with polyethylene inserts in bone models.
  • To compare the biomechanical performance of the dynamic system against traditional rigid pedicle screws.

Main Methods:

  • Utilized tensile, compression, and bending tests on bone models to assess screw performance.
  • Conducted fatigue testing over 1.0 x 10^6 cycles to evaluate pull-out strength.
  • Compared gripping capacity, flexion-extension moment, bending force, and pull-out force between dynamic and rigid systems.

Main Results:

  • Dynamic pedicle screws exhibited less than half the gripping capacity but significantly lower flexion-extension moments than rigid screws.
  • The dynamic system showed a different bending force response beyond 2.5° compared to the rigid system.
  • Fatigue testing revealed significantly higher pull-out force for dynamic pedicle screws compared to rigid ones.

Conclusions:

  • The dynamic pedicle screw system demonstrates potential for reducing screw loosening and adjacent segment pathology.
  • This novel device may offer a safer and more effective alternative for spinal stabilization in clinical applications.