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April 10, 2026Journal of Engineering and Science in Medical Diagnostics and Therapy

Experimental Characterization of Transient G-Forces in Spinal Fixation During Set Screw Failure

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Authors

MHMotaz HassanAWAmanpreet Singh WasirAMAjay Mahajan

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Overview

Experimental evaluation quantifies transient forces in spinal fixation, indicating pivotal design insights for implants.

Key Points

  • The aim is to quantify transient g-forces during manual set screw torquing and to validate torque failure models.
  • Used a sawbone spinal construct instrumented with accelerometers at strategic locations.
  • Captured transient accelerations during screw fracture with high-speed imaging and motion tracking.
  • Applied distortion energy theory and fully plastic torque models to predict break-off torque.
  • Recorded extreme g-forces up to 832g localized at the screw head, rapidly attenuating at the spinal center.
  • Theoretical predictions aligned closely with experimental torque measurements, validating analytical models.
  • Digital image analysis confirmed screw geometry precision with minimal error.

Cite This Study

Hassan et al. (2026) studied this question.

synapsesocial.com/papers/69d8930e6c1944d70ce042c6https://doi.org/10.1115/1.4071616
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