MECHANICAL PROPERTY DISTRIBUTIONS IN THE CANCELLOUS BONE OF THE HUMAN PROXIMAL FEMUR
MECHANICAL PROPERTY DISTRIBUTIONS IN THE CANCELLOUS BONE OF THE HUMAN PROXIMAL FEMUR
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DOI：
10.3109/17453678008990819
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发表时间：
1980-01-01
期刊：
影响因子：
--
通讯作者：
FERGUSON, AB
中科院分区：
文献类型：
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作者：
BROWN, TD;FERGUSON, AB
在常规尸检中获得的股骨近端被切割成大量的5 mm立方体标本，以获得关于松质骨材料特性的空间和方向变化的详细的定量信息。进行了低应变率压缩试验，评估了每个立方体在3个垂直测试方向上的表观弹性模量和屈服强度。计算机等值线程序被用来将实验数据组合成感兴趣部分的平滑分布图。硬度和强度的升高/降低与X线片特征明显对应。特别是在初级骨小梁系统穿过的区域发现了显著的硬度升高(比整体松质骨平均高出160-400%)，尽管当在不同于习惯性承重的方向测量时，骨样本的模数显著降低。弓形小梁系统也观察到了类似但不太明显的影响。Ward‘’S三角和粗隆间区域表现出明显的刚度和强度降低(比平均值低40%-90%)。所有截面的刚度和屈服强度分布在定性上是一致的。这种现象是单个压缩试验的弹性模量值和屈服强度值之间显著线性比例的必然结果。
Proximal femurs obtained at routine autopsy were sectioned into large numbers of 5 mm cubic specimens to obtain detailed quantitative information about the spatial and directional variations of the material properties of the cancellous bone. Low strain rate-compression tests were performed, evaluating the apparent elastic modulus and yield strength in 3 perpendicular testing directions for each cube. A computer contouring program was used to assemble the experimental data into smoothed distribution plots across sections of interest. Stiffness and strength elevations/reductions clearly corresponded to roentgenographic features. Especially prominent stiffness elevations (160-400% above the overall cancellous bone average) were found in the regions traversed by the primary trabeculation system, although the modulus of the bone samples was substantially reduced when measured in directions other than those of habitual weight-bearing. Similar but less pronounced effects were observed for the arcuate trabeculation system. Ward''s triangle and the intertrochanteric regions exhibited significant (as much as 40-90% below average) stiffness and strength reductions. There was close qualitative agreement between the stiffness and yield strength distributions for all sections. This phenomenon was a corollary of the remarkably linear proportionality between the modulus and yield strength values for individual compression tests.