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Understanding site-specific residual strain and architecture in bovine cortical bone

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Title: Understanding site-specific residual strain and architecture in bovine cortical bone
Authors: Giri, Bijay Browse this author
Tadano, Shigeru Browse this author →KAKEN DB
Fujisaki, Kazuhiro Browse this author →KAKEN DB
Todoh, Masahiro Browse this author →KAKEN DB
Keywords: residual strain
degree of orientation
strain adaptation
X-ray diffraction
Issue Date: 14-Nov-2008
Publisher: Pergamon Press
Journal Title: Journal of Biomechanics
Volume: 41
Issue: 15
Start Page: 3107
End Page: 3115
Publisher DOI: 10.1016/j.jbiomech.2008.09.012
PMID: 18986652
Abstract: Living bone is considered as adaptive material to the mechanical functions, which continually undergoes change in its histological arrangement with respect to external prolonged loading. Such remodeling phenomena within bone depend on the degree of stimuli caused by the mechanical loading being experienced, and therefore, are specific to the sites. In the attempts of understanding strain adaptive phenomena within bones, different theoretical models have been proposed. Also, the existing literatures mostly follow the measurement of surface strains using strain gauges to experimentally quantify the strains experienced in the functional environment. In this work, we propose a novel idea of understanding site-specific functional adaptation to the prolonged load in bone on the basis of inherited residual strains and structural organization. We quantified the residual strains and amount of apatite crystals distribution, i.e. the degree of orientation, using X-ray diffraction procedures. The sites of naturally existing hole in bone, called foramen, are considered from bovine femur and metacarpal samples. Significant values of residual strains are found to exist in the specimens. Trends of residual strains noted in the specimens are mostly consistent with the degree of orientation of the crystallites. These features explain the response behavior of bone to the mechanical loading history near the foramen sites. Preferential orientation of crystals mapped around a femoral foramen specimen showed furnished tailored arrangement of the crystals around the hole. Effect of external loading at the femoral foramen site is also explained by the tensile loading experiment.
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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