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Modelling cement augmentation: a comparative experimental and finite element study at the continuum level.

Y Zhao¹, Z M Jin, R K Wilcox

¹Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, UK. meyz@leeds.ac.uk

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine

|September 16, 2010

Summary

This study developed accurate finite element (FE) models for cement-augmented bone. Using image-based material properties improved stiffness predictions compared to homogeneous models, crucial for orthopaedic interventions.

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Area of Science:

Biomaterials Engineering
Computational Mechanics
Orthopaedic Research

Background:

Subject-specific computational models are vital for assessing orthopaedic interventions.
Modeling cement-augmented bone using these techniques remains underexplored.

Purpose of the Study:

To investigate methods for representing trabecular-like synthetic bone augmented with polymethyl methacrylate (PMMA) bone cement in finite element (FE) models.
To determine the accuracy of different material representation strategies for cement-augmented bone FE models.

Main Methods:

Generated subject-specific continuum level FE models from microCT images of untreated, fully augmented, and partially augmented synthetic bone specimens.
Iteratively determined material conversion factors between image greyscale and mechanical properties for pure synthetic bone and PMMA-augmented composite.
Matched FE predictions to experimental axial compression measurements to validate material property assignments.

Main Results:

FE models using image-derived material properties for partially augmented specimens achieved higher accuracy (approx. 5% error) compared to models using homogeneous properties (approx. 18% error).
Using the modulus of pure cement for augmented regions overestimated stiffness.
The apparent elastic modulus of the composite was primarily influenced by the synthetic bone properties.

Conclusions:

Image-based material property assignment significantly enhances the accuracy of FE models for cement-augmented bone.
This approach provides a more reliable method for simulating the mechanical behavior of augmented bone in orthopaedic research.
Accurate FE modeling is essential for predicting outcomes of orthopaedic interventions involving bone augmentation.