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Bone Ingrowth Around an Uncemented Femoral Implant Using Mechanoregulatory Algorithm: A Multiscale Finite Element

Basil Mathai1, Sanjay Gupta1

  • 1Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721 302, India.

Journal of Biomechanical Engineering
|August 23, 2021
PubMed
Summary

This study predicts bone ingrowth around cementless hip stems using a 3D mechanobiology model. Higher bone ingrowth occurred on the anterolateral side, improving implant stability.

Keywords:
mechanoregulatory bone ingrowthmultiscale modelproximal femuruncemented hip implant

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Area of Science:

  • Biomedical Engineering
  • Orthopedic Surgery
  • Computational Biology

Background:

  • Primary fixation and long-term stability of cementless femoral implants rely on bone ingrowth into porous coatings.
  • Quantifying peri-implant bone ingrowth using finite element (FE) analysis and mechanoregulatory principles is established, but tissue differentiation patterns on hip stems remain understudied.

Purpose of the Study:

  • To predict the spatial distribution of bone ingrowth around an uncemented hip stem using a 3D multiscale mechanobiology-based numerical framework.
  • To investigate tissue differentiation patterns and their contribution to implant stability.

Main Methods:

  • A three-dimensional (3D) multiscale mechanobiology-based numerical framework was employed.
  • Multiple load cases simulating daily activities (walking, stair climbing, sitting/standing) were used.
  • Local variations in bone properties and implant-bone displacements were considered to predict ingrowth in microscale representative volume elements (RVEs).

Main Results:

  • 20-70% bone tissue formation was predicted in most RVEs after 2 months, increasing the interbead tissue layer's Young's modulus to 1200-3000 MPa.
  • Greater bone ingrowth (>60%) was observed on the anterolateral side compared to the posteromedial side (20-50%).
  • New bone tissue formed within the interbead spacing, adhering to the implant surface.

Conclusions:

  • The study provides insights into the degree and spatial distribution of osseointegration for porous-coated femoral implants.
  • The findings highlight the influence of loading conditions and implant region on bone ingrowth.
  • This mechanobiology-based framework can predict evolutionary bone ingrowth and enhance understanding of cementless implant stability.