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首页> 外文期刊>Journal of Biomechanics >Estimation of the poroelastic parameters of cortical bone.
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Estimation of the poroelastic parameters of cortical bone.

机译：估计皮质骨的孔隙弹性参数。

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摘要

Cortical bone has two systems of interconnected channels. The largest of these is the vascular porosity consisting of Haversian and Volkmann's canals, with a diameter of about 50 microm, which contains a.o. blood vessels and nerves. The smaller is the system consisting of the canaliculi and lacunae: the canaliculi are at the submicron level and house the protrusions of the osteocytes. When bone is differentially loaded, fluids within the solid matrix sustain a pressure gradient that drives a flow. It is generally assumed that the flow of extracellular fluid around osteocytes plays an important role not only in the nutrition of these cells, but also in the bone's mechanosensory system.The interaction between the deformation of the bone matrix and the flow of fluid can be modelled using Biot's theory of poroelasticity. However, due to the inhomogeneity of the bone matrix and the scale of the porosities, it is not possible to experimentally determine all the parameters that are needed for numerical implementation. The purpose of this paper is to derive these parameters using composite modelling and experimental data from literature. A full set of constants is estimated for a linear isotropic description of cortical bone as a two-level porous medium. Bone, however, has a wide variety of mechanical and structural properties; with the theoretical relationships described in this note, poroelastic parameters can be derived for other bone types using their specific experimental data sets.
机译：皮质骨具有两个相互连接的通道系统。其中最大的是由哈弗斯和沃克曼运河组成的血管孔隙，直径约为50微米，包含a.o。血管和神经。较小的是由小管和腔组成的系统：小管处于亚微米水平，并容纳骨细胞的突起。当骨骼受到不同的负载时，固体基质中的流体会承受驱动流动的压力梯度。通常认为骨细胞周围的细胞外液流动不仅在这些细胞的营养中起着重要作用，而且在骨骼的机械感觉系统中也起着重要的作用。可以模拟骨基质的变形与液体流动之间的相互作用使用比奥的多孔弹性理论。然而，由于骨基质的不均匀性和孔隙率的大小，不可能通过实验确定数值实现所需的所有参数。本文的目的是使用合成模型和来自文献的实验数据得出这些参数。为将皮质骨作为两级多孔介质进行线性各向同性描述，需要估算全套常数。但是，骨骼具有多种机械和结构特性。根据本说明中描述的理论关系，可以使用其他特定类型的实验数据集推导其他骨骼类型的孔隙弹性参数。

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