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Related Experiment Videos

Constitutive models for impacted morsellised cortico-cancellous bone.

Andrew Phillips1, Pankaj Pankaj, Fraser May

  • 1School of Engineering and Electronics, The University of Edinburgh, Edinburgh, Scotland, UK. andrew.philips@ed.ac.uk

Biomaterials
|November 29, 2005
PubMed
Summary

New models describe morsellised cortico-cancellous bone (MCB) behavior under pressure. These findings enable realistic finite element analysis for hip implants, improving surgical outcomes in revision hip arthroplasty.

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Area of Science:

  • Biomaterials Science
  • Orthopedic Biomechanics
  • Computational Solid Mechanics

Background:

  • Morsellised cortico-cancellous bone (MCB) is crucial for bone grafting in revision hip arthroplasty.
  • Accurate constitutive models are needed to simulate MCB behavior in finite element analysis (FEA).

Purpose of the Study:

  • To develop constitutive models for the visco-elastic and elasto-plastic behavior of MCB.
  • To enable realistic FEA of MCB in orthopedic implants, specifically acetabular constructs.

Main Methods:

  • Confined compression testing was performed on MCB.
  • Developed linear elastic, visco-elastic (Prony series), and elasto-plastic (Drucker Prager Cap) models.
  • Characterized consolidation using an exponential function.

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Main Results:

  • Elastic modulus (E) of MCB is a linear function of applied pressure (p), ranging from 3 to 30 N/mm².
  • Visco-elastic behavior modeled with a fourth-order Prony series.
  • Plastic behavior accurately described by the Drucker Prager Cap yield criterion.

Conclusions:

  • The developed constitutive models provide a realistic representation of MCB behavior.
  • These models facilitate improved FEA for acetabular constructs in revision hip arthroplasty using impaction grafting.
  • Enhances understanding of bone graft mechanics for better implant design and surgical planning.