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首页> 外文期刊>Journal of Biomechanics >Using digital image correlation to determine bone surface strains during loading and after adaptation of the mouse tibia.
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Using digital image correlation to determine bone surface strains during loading and after adaptation of the mouse tibia.

机译：使用数字图像相关性来确定在加载和适应胫骨胫骨后的骨表面应变。

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摘要

Previous models of cortical bone adaptation, in which loading is imposed on the bone, have estimated the strains in the tissue using strain gauges, analytical beam theory, or finite element analysis. We used digital image correlation (DIC), tracing a speckle pattern on the surface of the bone during loading, to determine surface strains in a murine tibia during compressive loading through the knee joint. We examined whether these surface strains in the mouse tibia are modified following two weeks of load-induced adaptation by comparison with contralateral controls. Results indicated non-uniform strain patterns with isolated areas of high strain (0.5%), particularly on the medial side. Strain measurements were reproducible (standard deviation of the error 0.03%), similar between specimens, and in agreement with strain gauge measurements (between 0.1 and 0.2% strain). After structural adaptation, strains were more uniform across the tibial surface, particularly on the medial side where peak strains were reduced from 0.5% to 0.3%. Because DIC determines local strains over the entire surface, it will provide a better understanding of how strain stimulus influences the bone response during adaptation.
机译：以前的皮质骨适应模型（其中将载荷施加到骨骼上）已经使用应变仪，分析束理论或有限元分析来估计组织中的应变。我们使用数字图像相关性（DIC），在加载过程中跟踪骨骼表面的斑点图案，以确定在通过膝关节的压缩加载过程中鼠胫骨的表面应变。我们检查了小鼠胫骨中的这些表面张力是否在负荷诱导适应后两周与对侧对照进行了比较。结果表明，非均匀应变模式具有高应变（0.5％）的孤立区域，尤其是在内侧。应变测量结果是可重复的（误差的标准偏差为0.03％），样品之间相似，并且与应变仪测量结果一致（0.1到0.2％应变）。结构适应后，整个胫骨表面的应变更加均匀，尤其是在内侧，峰值应变从0.5％降低至0.3％。由于DIC确定整个表面上的局部应变，因此它将更好地了解应变刺激如何在适应过程中影响骨骼反应。

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