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首页> 外文期刊>Journal of Biomechanics >Links between mechanical behavior of cancellous bone and its microstructural properties under dynamic loading
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Links between mechanical behavior of cancellous bone and its microstructural properties under dynamic loading

机译：动态载荷下松质骨力学行为与其微观结构性质之间的联系

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Previous studies show that in vivo assessment of fracture risk can be achieved by identifying the relationships between microarchitecture description from clinical imaging and mechanical properties. This study demonstrates that results obtained at low strain rates can be extrapolated to loadings with an order of magnitude similar to trauma such as car crashes. Cancellous bovine bone specimens were compressed under dynamic loadings (with and without confinement) and the mechanical response properties were identified, such as Young's modulus, ultimate stress, ultimate strain, and ultimate strain energy. Specimens were previously scanned with pQCT, and architectural and structural microstructure properties were identified, such as parameters of geometry, topology, connectivity and anisotropy. The usefulness of micro-architecture description studied was in agreement with statistics laws. Finally, the differences between dynamic confined and non-confined tests were assessed by the bone marrow influence and the cancellous bone response to different boundary conditions. Results indicate that architectural parameters, such as the bone volume fraction (BV/TV), are as strong determinants of mechanical response parameters as ultimate stress at high strain rates (p-value < 0.001). This study reveals that cancellous bone response at high strain rates, under different boundary conditions, can be predicted from the architectural parameters, and that these relations with mechanical properties can be used to make fracture risk prediction at a determined magnitude. (C) 2014 Elsevier Ltd. All rights reserved.
机译：以前的研究表明，通过从临床影像学和力学性能中识别微结构描述之间的关系，可以实现体内骨折风险的评估。这项研究表明，在低应变率下获得的结果可以外推到与车祸等创伤类似的数量级载荷上。松散的牛骨标本在动态载荷（有或没有约束）下被压缩，并确定了机械响应特性，例如杨氏模量，极限应力，极限应变和极限应变能。样品事先用pQCT进行了扫描，并确定了建筑和结构的微观结构特性，例如几何参数，拓扑，连通性和各向异性。研究的微体系结构描述的有用性与统计法一致。最后，通过骨髓影响和松质骨对不同边界条件的反应来评估动态封闭和非封闭测试之间的差异。结果表明，在高应变速率下，诸如骨体积分数（BV / TV）之类的建筑参数与极限应力一样，是决定机械响应参数的重要因素（p值<0.001）。这项研究表明，可以根据建筑参数预测在不同边界条件下高应变率下的松质骨反应，并且这些与力学性能的关系可以用来确定确定的断裂风险。 （C）2014 Elsevier Ltd.保留所有权利。

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