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A method on strain measurement of HAP in cortical bone from diffusive profile of X-ray diffraction

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Title: A method on strain measurement of HAP in cortical bone from diffusive profile of X-ray diffraction
Authors: Fujisakia, Kazuhiro Browse this author →KAKEN DB
Tadano, Shigeru2 Browse this author →KAKEN DB
Sasaki, Naoki Browse this author →KAKEN DB
Authors(alt): 但野, 茂2
Keywords: Biomechanics
X-ray Diffraction
Cortical Bone
Strain Measurement
Issue Date: 2006
Publisher: Elsevier Ltd
Journal Title: Journal of Biomechanics
Volume: 39
Issue: 3
Start Page: 579
End Page: 586
Publisher DOI: 10.1016/j.jbiomech.2005.01.001
PMID: 16389098
Abstract: Bone tissue is a composite material composed of hydroxyapatite (HAp) and collagen matrix. As HAp is a crystalline structure, an X-ray diffraction method is available to measure the lattice strain of HAp crystals. However, mineral particles of HAp in bone have much lower crystallinity than usual crystalline materials, which show a diffusive intensity profile of X-ray diffraction. It is not easy to determine quantitatively an infinitesimal strain of HAp from the peak position of diffusive profile. In order to improve the accuracy of strain measurement of HAp in bone tissue and to obtain reproducible results, this paper proposes an X-ray diffraction method applied to a diffusive profile for low crystallinity. This method is to estimate the lattice strain of HAp using not a peak position but a whole diffraction profile. In this experiment, a strip specimen of 28×8×2 mm was made from bone axial, outside circumferential and cross sectional circumferential region in the cortical bone of bovine femur. The X-ray diffraction measurements were carried out before and after applying an external load. As a result, the precision of strain measurement was much improved by this method. Although a constant value of macroscopic strain was applied in the specimen, the lattice strain had a lower value than the macroscopic strain and had a different value in each specimen.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 但野 茂

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