X線回折法による牛大腿皮質骨の引張ひずみ測定

概要

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Bone tissue is a composite material composed of hydroxyapatite (HAp) and collagen. As HAp in bone tissue exists in the form of crystalline particles, an X-ray diffraction method is useful to determine a lattice strain of HAp, which can be a measure of strain distribution in bone tissue. However, HAp crystals in bone have been known to have the low degree of crystallization. A quantitative determination of the lattice strain of HAp in bone seems to be difficult. We have proposed a new method to determine the lattice strain of crystals with the low degree of crystallization. The method improved the accuracy and the reproducibility of the strain measurement of HAp in bone tissue. In this work, in order to investigate the relationship between the macroscopic strain of bone and the strain of HAp lattice, the X-ray diffraction measurements were performed under tensile loading. The cortical bone specimens of 50×6×0.8 mm in average were cut from a shaft of bovine femur. The stepwise tensile load was applied to the specimen during the X-ray irradiation. The lattice strain value of HAp was lower than the macroscopic strain value detected by a strain gauge, though the relationship of both values were almost linear.
日本バイオレオロジ-学会の論文