X線回折法による生体骨組織内HApの結晶ひずみ測定

概要

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Bone tissue is a composite material composed of hydroxyapatite (HAp) and collagen. Because HAp in bone tissue makes a crystal structure, an X-ray diffraction method is available to measure the strain of HAp. In the X-ray diffraction method using characteristic X-rays with a unique wavelength, HAp in compact bone has much lower crystallization than metal as steel. The peak position of diffracted intensity is not easy to determine from the gradual intensity-angle profile. This work proposes a method to calculate the lattice strain from the information of a whole diffraction profile without a peak position. In this experiment, strip specimens of 28×8×2 mm in size with their long axis aligned to the bone axial or the circumferential direction were cut from cortical bone in a shaft of bovine femur. To confirm the relationship between applied macroscopic strain and lattice strain in bone tissue, a four-point bending device was developed to apply bending load to the specimen during the X-ray irradiation. Macroscopic strain of the specimen was measured by a strain-gauge bonded to opposite side of the surface irradiated by X-rays. As a result, the accuracy of measurement by this method was better improved.
社団法人日本機械学会の論文
2003-09-25