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A computational optimisation study of hip implant using density mapping functionally graded biomimetic TPMS-based

Mahtab Vafaeefar1, Conall Quinn1, Kevin M Moerman2,3

  • 1Biomechanics Research Centre (BMEC), School of Engineering, Institute for Health Discovery and Innovation, College of Science and Engineering, University of Galway, Galway, Ireland.

NPJ Metamaterials
|November 24, 2025
PubMed
Summary

This study optimized hip implants using a biomimetic lattice structure to reduce stress shielding. The novel design promotes better bone integration and stress distribution for improved implant performance.

Keywords:
Bioinspired materialsComputational methodsMechanical properties

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Area of Science:

  • Biomaterials Engineering
  • Computational Mechanics
  • Orthopedic Surgery

Background:

  • Stress shielding is a significant complication in hip implants, leading to bone density loss.
  • Current implants often have uniform stiffness, mismatching bone properties and causing uneven stress distribution.
  • Biomimetic designs offer potential for improved bone-implant integration.

Purpose of the Study:

  • To develop and evaluate a computational framework for optimizing hip implant design.
  • To reduce stress shielding by creating a functionally graded biomimetic lattice structure.
  • To enhance bone formation and stress transmission at the bone-implant interface.

Main Methods:

  • Utilized an inverse bone remodelling algorithm for density and stiffness optimization.
  • Mapped a triply periodic minimal surface lattice structure onto the implant design.
  • Employed finite element analysis with a bone remodelling algorithm to simulate bone response.
  • Compared the porous lattice implant against a fully solid implant model.

Main Results:

  • Achieved a non-uniform density distribution with lower density at the stem's sides and higher density medially.
  • Demonstrated improved bone formation at the bone-implant interface compared to the solid model.
  • Showcased enhanced stress transmission to the surrounding bone tissue.
  • Reduced overall implant mass through lattice structure optimization.

Conclusions:

  • The functionally graded biomimetic lattice structure effectively reduces stress shielding in hip implants.
  • Optimized material distribution enhances bone integration and mechanical load transfer.
  • Computational optimization frameworks are valuable for designing next-generation orthopedic implants.