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Time-elapsed screw insertion with microCT imaging.

M K Ryan1, A A Mohtar1, T M Cleek1

  • 1Medical Device Research Institute, School of Computer Science, Engineering and Mathematics, Flinders University, GPO Box 2100, Adelaide, South Australia 5001, Australia.

Journal of Biomechanics
|January 10, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a novel device for time-elapsed analysis of bone screw insertion, visualizing micro-mechanical responses. Findings show bone deformation is localized around the screw thread, offering insights into implant stability.

Keywords:
Cancellous boneInsertion torqueScrew insertionTime-elapsed

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Area of Science:

  • Biomaterials Science
  • Orthopedic Biomechanics
  • Medical Imaging

Background:

  • Assessing bone-implant interactions is crucial for orthopedic surgery success.
  • Current methods lack detailed, time-elapsed micro-structural analysis during screw insertion.

Purpose of the Study:

  • To develop and validate a novel device for time-elapsed, in-situ microCT analysis of bone screw insertion.
  • To investigate the micro-mechanical response of trabecular bone during screw tightening.

Main Methods:

  • A computer-controlled device was developed for step-wise screw insertion into bone specimens within a microCT scanner.
  • Simultaneous recording of insertion torque, compression, and rotation angle.
  • Acquisition of sequential microCT image datasets at various insertion torque intervals.

Main Results:

  • A strong correlation (R²=0.89) was found between initial contact torque and stripping torque.
  • Trabecular bone deformation was confined to within 1mm of the screw thread diameter.
  • Significant deformation was minimal until the final stages of insertion (80% to failure).

Conclusions:

  • The novel device enables unprecedented visualization of peri-implant bone micro-mechanics during screw tightening.
  • Understanding micro-structural responses to torque is key to optimizing implant fixation and preventing failure.
  • Further research will enhance comprehension of micro-structural effects and failure mechanisms.