Distribution of hydroxyapatite crystallite orientation and ultrasonic wave velocity in ring-shaped cortical bone of bovine femur

Yu Yamato*, Mami Matsukawa, Hirofumi Mizukawa, Takahiko Yanagitani, Kaoru Yamazaki, Akira Nagano

*この研究の対応する著者

研究成果: Article査読

13 被引用数 (Scopus)

抄録

At the nanoscopic level, bone consists of calcium phosphate, which forms incomplete hydroxyapatite (HAp) crystals. The preferred orientation of the c-axis of HAp crystallites induces anisotropy and inhomogeneity of elastic properties in bone. In this study, the effect of the preferred orientation of HAp crystallites on the spatial distribution of ultrasonic wave velocity was experimentally investigated, considering bone mineral density (BMD) and microstructure. Three ring-shaped cortical bone samples were made from a 36-month-old bovine femur. Longitudinal wave velocity was measured by a conventional ultrasonic pulse system, using self-made polyvinylidene fluoride transducers. The integrated intensity of the (0002) peak obtained using X-ray diffraction was estimated to evaluate the amount of preferred orientation. The velocity distribution pattern was similar to the distribution of integrated intensity of (0002). The effect of the preferred orientation of HAp crystallites on velocity was clearly observed in the plexiform structure, despite the fact that the BMD value was almost independent of the preferred orientation of HAp crystallites. Velocity measurement of cortical bone can reveal information about HAp crystallite orientation.

本文言語English
論文番号4536924
ページ(範囲)1298-1303
ページ数6
ジャーナルIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
55
6
DOI
出版ステータスPublished - 2008 6月
外部発表はい

ASJC Scopus subject areas

  • 器械工学
  • 音響学および超音波学
  • 電子工学および電気工学

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