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Physically Realizable Three-Dimensional Bone Prosthesis Design With Interpolated Microstructures.

Andrew D Cramer1, Vivien J Challis1, Anthony P Roberts1

  • 1School of Mathematics and Physics, The University of Queensland, Brisbane QLD 4072, Australia

Journal of Biomechanical Engineering
|December 21, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for designing porous femoral implants with adaptable microstructures. These advanced designs reduce stress and bone resorption, outperforming traditional homogeneous implants and proving manufacturable.

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Area of Science:

  • Biomaterials Engineering
  • Orthopedic Implant Design
  • Computational Mechanics

Background:

  • Femoral implants are crucial in orthopedic surgery, but traditional designs face challenges like stress shielding and bone resorption.
  • Optimizing implant microstructure is key to improving long-term bone-prosthetic integration and implant survival.
  • Current design methodologies often overlook the potential of spatially varying microstructures.

Purpose of the Study:

  • To develop a novel computational approach for designing three-dimensional, physically realizable porous femoral implants.
  • To optimize implant designs by minimizing shear stress at the bone-prosthetic interface and constraining bone resorption.
  • To investigate the impact of varying microstructures on implant performance and manufacturability.

Main Methods:

  • Utilized a simplified design domain for optimization, incorporating strain energy-based bone resorption constraints.
  • Employed shape interpolation to construct microstructure sets from multifunctional base microstructures.
  • Evaluated designs with homogeneous versus spatially varying microstructures for a femoral implant application.

Main Results:

  • Designs incorporating spatially varying microstructures significantly outperformed those with homogeneous microstructures.
  • The selection of specific microstructure sets influenced optimization outcomes and final implant designs.
  • A proof-of-concept metal prototype fabricated using selective laser melting (SLM) validated the proposed design approach's manufacturability.

Conclusions:

  • The developed design methodology enables the creation of advanced porous femoral implants with tailored microstructures.
  • Spatially varying microstructures offer superior performance compared to homogeneous designs for femoral implants.
  • The approach demonstrates a viable pathway for fabricating patient-specific, high-performance orthopedic implants.