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Mechanics of linear microcracking in trabecular bone.

Max A Hammond1, Joseph M Wallace2, Matthew R Allen3

  • 1Department of Mechanical Engineering, Purdue University, West Lafayette, IN, USA.

Journal of Biomechanics
|November 27, 2018
PubMed
Summary

Microcracking in trabecular bone is influenced by its microarchitecture and material properties. Anisotropic and heterogeneous bone tissue significantly enhances toughness and resistance to microcrack formation.

Keywords:
AnisotropyHeterogeneityMicrocrackingStress analysisTrabecular boneXFEM

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Area of Science:

  • Biomechanics
  • Materials Science
  • Orthopedic Research

Background:

  • Microcracking in trabecular bone leads to mechanical degradation and influences tissue remodeling.
  • Understanding the mechanical stress state requires considering microarchitecture, elastic heterogeneity, and anisotropy.

Purpose of the Study:

  • To investigate how microarchitecture, elastic heterogeneity, material separation properties, and anisotropy affect microcrack formation in bone tissue.
  • To quantify the impact of these factors on bone's resistance to microcracking.

Main Methods:

  • Utilized microscale bone models.
  • Employed the extended finite element method (XFEM) for simulations.

Main Results:

  • Anisotropy and heterogeneity significantly enhance bone tissue toughness.
  • These properties increase resistance to microcrack initiation and propagation.
  • Calculated a four-fold increase in compressive strain for microcrack initiation in anisotropic, heterogeneous tissue compared to homogeneous, isotropic tissue.

Conclusions:

  • Bone tissue's anisotropic and heterogeneous nature are critical factors in its mechanical integrity.
  • These characteristics substantially improve trabecular bone's resistance to microdamage and fracture.
  • The findings highlight the importance of detailed microstructural and material property analysis for predicting bone mechanics.