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首页> 外文期刊>Journal of Biomechanics >The effect of hydration on mechanical anisotropy, topography and fibril organization of the osteonal lamellae
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The effect of hydration on mechanical anisotropy, topography and fibril organization of the osteonal lamellae

机译：水合作用对骨片的机械各向异性，形貌和原纤维组织的影响

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The effect of hydration on the mechanical properties of osteonal bone, in directions parallel and perpendicular to the bone axis, was studied on three length scales: (i) the mineralized fibril level (~100. nm), (ii) the lamellar level (~6. μm); and (iii) the osteon level (up to ~30. μm).We used a number of techniques, namely atomic force microscopy (AFM), nanoindentation and microindentation. The mechanical properties (stiffness, modulus and/or hardness) have been studied under dry and wet conditions. On all three length scales the mechanical properties under dry conditions were found to be higher by 30-50% compared to wet conditions. Also the mechanical anisotropy, represented by the ratio between the properties in directions parallel and perpendicular to the osteon axis (anisotropy ratio, designated here by AnR), surprisingly decreased somewhat upon hydration. AFM imaging of osteonal lamellae revealed a disappearance of the distinctive lamellar structure under wet conditions. Altogether, these results suggest that a change in mineralized fibril orientation takes place upon hydration.
机译：在三个长度尺度上研究了水化对平行和垂直于骨轴方向的骨质骨骼力学性能的影响：（i）矿化的原纤维水平（〜100。nm），（ii）层状水平（ 〜6。μm）; （iii）骨水平（最大约30.μm）。我们使用了多种技术，即原子力显微镜（AFM），纳米压痕和微压痕。在干燥和潮湿的条件下研究了机械性能（刚度，模量和/或硬度）。在所有三个长度尺度上，发现在干燥条件下的机械性能比潮湿条件下高30-50％。同样，机械各向异性由在与骨轴平行和垂直的方向上的性质之间的比率（各向异性比率，在此由AnR表示）表示，在水合时令人惊奇地降低了。骨薄层的原子力显微镜成像显示在潮湿条件下独特的层状结构消失。总而言之，这些结果表明矿化的原纤维取向在水合时发生变化。

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