Influence of osteon area fraction and degree of orientation of HAp crystals on mechanical properties in bovine femur

Yamada, Satoshi; Tadano, Shigeru; Fujisaki, Kazuhiro; Kodaki, Yuka

Influence of osteon area fraction and degree of orientation of HAp crystals on mechanical properties in bovine femur

Yamada, Satoshi; Tadano, Shigeru; Fujisaki, Kazuhiro et al.

Journal of biomechanics, 2013, 46(1), 31-35

Permalink : https://hdl.handle.net/2115/51137

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アクセス権	open access
URI	https://hdl.handle.net/2115/51137
タイトル	Influence of osteon area fraction and degree of orientation of HAp crystals on mechanical properties in bovine femur
著者	Yamada, Satoshi ; Tadano, Shigeru ; Fujisaki, Kazuhiro ; Kodaki, Yuka
e-Rad_Researcher 90730169 著者名 Yamada, Satoshi
e-Rad_Researcher 50175444 著者名 Tadano, Shigeru
e-Rad_Researcher 90435678 著者名 Fujisaki, Kazuhiro
著者名 Kodaki, Yuka
言語	英語
キーワード	Biomechanics
	Bone
	Osteon
	Hydroxyapatite
	X-ray Diffraction
発行日	2013-01-04
出版者	Elsevier
収録物名	Journal of biomechanics
巻(号)	46(1)
ページ	31-35
抄録	Cortical bone has a hierarchical structure, spanning from the macrostructure at several millimeters or whole bone level, the microstructure at several hundred micrometers level, to the nanostructure at hydroxyapatite (HAp) crystals and collagen fibrils levels. The aim of the study is to understand the relationship between the HAp crystal orientation and the elastic modulus and the relationship between the osteon area fraction and the deformation behavior of HAp crystals in cortical bone. In the experiments, five strip specimens (40×2×1 mm3) aligned with the bone axis were taken from the cortical bone of a bovine femur. The degree of c-axis orientation of HAp crystals in the specimens was measured with the X-ray diffraction technique with the imaging plate. To measure the deformation behavior of HAp crystals in the specimens, tensile tests under X-ray irradiation were conducted. The specimens were cut at the X-ray measurement positions and osteon area fraction and porosity at the transverse cross-sections were observed. Further, the volume fraction of HAp of the specimens was measured. Results showed the degree of c-axis orientation of HAp crystals was positively correlated with the elastic modulus of the specimens (r=0.94). The volume fraction of HAp and the porosity showed no statistical correlation with the elastic modulus and the tensile strength. The HAp crystal strain εH increased linearly with the bone tissue strain ε. The average value of εH/ε was 0.69±0.13 and there was no correlation between the osteon area fraction and εH/ε (r=−0.27, p=0.33). The results suggest that the degree of c-axis orientation of HAp crystals affects the elastic modulus and the magnitude of HAp crystal strain does not depend on the osteon area fraction.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
PISSN	0021-9290
NCID	AA00694200
関連情報	PMID 23084783
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.jbiomech.2012.09.020