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Friction coefficient and effective interference at the implant-bone interface.

Niklas B Damm1, Michael M Morlock1, Nicholas E Bishop1

  • 1Institute of Biomechanics, TUHH Hamburg University of Technology, Denickestraße 15, 21073 Hamburg, Germany.

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Summary
This summary is machine-generated.

This study reveals that implant friction coefficients vary with contact pressure, unlike standard measurements. Effective interference is significantly reduced by bone deformation during porous implant insertion.

Keywords:
Bone-implant interface stressImplant coatingsPress-fit frictionµCT bone deformation

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Area of Science:

  • Biomaterials Engineering
  • Orthopedic Biomechanics
  • Tribology

Background:

  • Standard friction coefficient measurements for implants often use constant contact pressure, not reflecting dynamic in-vivo conditions.
  • Bone abrasion and plastic deformation during implant insertion can reduce effective interference, impacting fixation stability.
  • Understanding friction and deformation is crucial for accurate press-fit simulation and implant design.

Purpose of the Study:

  • To determine friction coefficients during simulated implantation and explantation of porous and polished implants against trabecular bone.
  • To analyze permanent bone deformation and quantify effective interference after implantation.
  • To investigate the influence of normal contact stress on friction coefficients for different implant surface topographies.

Main Methods:

  • Simulated implantation and explantation of angled porous and polished implants against trabecular bone specimens.
  • Measurement of radial forces to calculate friction coefficients under varying normal contact stresses.
  • Analysis of permanent deformation to determine effective interference post-implantation.

Main Results:

  • Friction coefficients for porous surfaces varied with normal contact stress, initially increasing then decreasing.
  • Rougher porous surfaces exhibited higher peak friction coefficients than less porous ones.
  • Polished surfaces showed friction coefficients independent of contact stress and significantly lower than porous surfaces.
  • Effective interference was reduced by up to 70% for porous implants due to bone deformation.
  • Friction coefficients were slightly lower during explantation than implantation for porous surfaces.

Conclusions:

  • Friction coefficients are dependent on normal contact stress and implant surface topography, challenging standard measurement protocols.
  • Significant loss of effective interference occurs during porous implant insertion, impacting press-fit stability.
  • Accurate press-fitting simulations require accounting for the dynamic variation in friction and bone deformation.