Biomechanics and Modeling in Mechanobiology

, Volume 16, Issue 1, pp 159–172 | Cite as

Elastic properties of woven bone: effect of mineral content and collagen fibrils orientation

Original Paper
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Abstract

Woven bone is a type of tissue that forms mainly during fracture healing or fetal bone development. Its microstructure can be modeled as a composite with a matrix of mineral (hydroxyapatite) and inclusions of collagen fibrils with a more or less random orientation. In the present study, its elastic properties were estimated as a function of composition (degree of mineralization) and fibril orientation. A self-consistent homogenization scheme considering randomness of inclusions’ orientation was used for this purpose. Lacuno-canalicular porosity in the form of periodically distributed void inclusions was also considered. Assuming collagen fibrils to be uniformly oriented in all directions led to an isotropic tissue with a Young’s modulus \(E = 1.90\) GPa, which is of the same order of magnitude as that of woven bone in fracture calluses. By contrast, assuming fibrils to have a preferential orientation resulted in a Young’s modulus in the preferential direction of 9–16 GPa depending on the mineral content of the tissue. These results are consistent with experimental evidence for woven bone in foetuses, where collagen fibrils are aligned to a certain extent.

Keywords

Woven bone Multiscale micromechanical model Homogenization Mineral content 
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Notes

Acknowledgments

This work was supported by grant DPI2014-58233-P from the Ministerio de Economía y Competitividad (Spain).

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© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringUniversidad de SevillaSevilleSpain

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