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首页> 外文期刊>Journal of orthopaedic research >Differences in sensitivity to microstructure between cyclic- and impact-based microindentation of human cortical bone
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Differences in sensitivity to microstructure between cyclic- and impact-based microindentation of human cortical bone

机译：人皮质骨循环与抗冲击基微观细胞微观结构敏感性的差异

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Unlike the known relationships between traditional mechanical properties and microstructural features of bone, the factors that influence the mechanical resistance of bone to cyclic reference point microindention (cRPI) and impact microindention (IMI) have yet to be identified. To determine whether cRPI and IMI properties depend on microstructure, we indented the tibia mid-shaft, the distal radius, and the proximal humerus from 10 elderly donors using the BioDent and OsteoProbe (neighboring sites). As the only output measure of IMI, bone material strength index (BMSi) was significantly different across all three anatomical sites being highest for the tibia mid-shaft and lowest for the proximal humerus. Total indentation distance (inverse of BMSi) was higher for the proximal humerus than for the tibia mid-shaft but was not different between other anatomical comparisons. As a possible explanation for the differences in BMSi, pore water, as determined by H-1 nuclear magnetic resonance, was lowest for the tibia and highest for the humerus. Moreover, the local intra-cortical porosity, as determined by micro-computed tomography, was negatively correlated with BMSi for both arm bones. BMSi was also positively correlated with peak bending stress of cortical bone extracted from the tibia mid-shaft. Microstructural correlations with cRPI properties were not significant for any of the bones. The one exception was that average energy dissipated during cRPI was negatively correlated with local tissue mineral density in the tibia mid-shaft. With higher indentation force and larger tip diameter than cRPI, only IMI appears to be sensitive to the underlying porosity of cortical bone. (c) 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:1442-1452, 2017.
机译：与骨骼的传统机械性能和微观结构特征之间的已知关系不同，尚未确定影响骨骼的机械阻力（CRPI）和冲击微吲哚（IMI）的因素。为了确定CRPI和IMI属性是否依赖于微观结构，我们使用生物和骨瓣（相邻位点）缩进来自10名老年人的胫骨中轴，远端半径和近端肱骨。作为IMI的唯一输出量度，骨材料强度指数（BMSI）在所有三个解剖部位对于胫骨中轴最高的所有三个解剖部位和最低用于肱骨的最低限度差异很大。近端肱骨的总压痕距离（BMSI的倒数）比胫骨中轴更高，但在其他解剖学比较之间并不不同。作为BMSI的差异，由H-1核磁共振确定的BMSI，孔隙水的可能解释，对于胫骨最低，并且对于肱骨最高。此外，通过微计算断层扫描确定的局部内部内部孔隙率与两个臂骨骼的BMSI负相关。 BMSI也与从胫骨中轴提取的皮质骨的峰值弯曲应力呈正相关。与CRPI属性的微观结构相关性对于任何骨骼都不重要。一个例外是CRPI期间的平均能量与胫骨中轴的局部组织矿物密度呈负相关。具有比CRPI更高的压痕力和较大的尖端直径，似乎只有IMI对皮质骨的底层孔隙率敏感。 （c）2016骨科研究会。由Wiley Hearyicals，Inc.J Orthop Res 35：1442-1452,2017出版。

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