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首页> 外文期刊>Journal of Biomechanics >Anisotropy of bovine cortical bone tissue damage properties
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Anisotropy of bovine cortical bone tissue damage properties

机译：牛皮质骨组织损伤的各向异性

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Bone is a heterogeneous, anisotropic natural composite material. Several studies have measured human cortical bone elastic properties in different anatomical directions and found that the Young's modulus was highest in the longitudinal, followed by the tangential and then by the radial direction. This study compared the Young's modulus, the accumulated microdamage and local strains related to the failure process in these three anatomical directions. Cortical bone samples (≈360μm×360μm) were mechanically tested in three-point bending and concomitantly imaged to assess local strains using digital image correlation technique. The bone whitening effect was used to detect microdamage formation and propagation. No statistically significant difference was found between the Young's modulus of longitudinal (9.4±2.0GPa) and tangential (9.9±1.8GPa) bovine bone samples, as opposed to previous findings on human bone samples. The same similarity was found for the whitening values (5000±1900pix/mm2 for longitudinal, 5800±2600pix/mm2 for tangential) and failure strains (16.8±7.0% for longitudinal, 19.1±3.2% for tangential) as well. However, significantly lower values were observed in the radial samples for Young's modulus (5.92±0.77GPa), whitening (none or minimal) and failure strain (10.8±3.8%). For strains at whitening onset, no statistically significant difference was seen for the longitudinal (5.1±1.6%) and radial groups (4.2±2.0%), however, the tangential values were significantly greater (7.0±2.4%). The data implies that bovine cortical bone tissue in long bones is designed to withstand higher loads in the longitudinal and tangential directions than in the radial one. A possible explanation of the anisotropy in the mechanical parameters derived here might be the structure of the tissues in the three directions tested.
机译：骨是一种非均质，各向异性的天然复合材料。多项研究测量了人体在不同解剖学方向上的皮质骨弹性，发现杨氏模量在纵向上最高，其次是切线，然后是径向。这项研究比较了在这三个解剖学方向上与破坏过程相关的杨氏模量，累积的微损伤和局部应变。对皮质骨样品（≈360μm×360μm）进行了三点弯曲的机械测试，并使用数字图像相关技术对其进行了成像，以评估局部应变。骨骼增白作用用于检测微损伤的形成和传播。纵向（9.4±2.0GPa）和切向（9.9±1.8GPa）牛骨样品的杨氏模量之间没有统计学上的显着差异，这与先前在人骨样品上的发现相反。增白值（纵向为5000±1900pix / mm2，切向为5800±2600pix / mm2）和破坏应变（纵向为16.8±7.0％，切向为19.1±3.2％）也发现了相同的相似性。但是，在径向样品中观察到的杨氏模量（5.92±0.77GPa），白化（无或最小）和破坏应变（10.8±3.8％）的值明显较低。对于在美白开始时的菌株，纵向组（5.1±1.6％）和径向组（4.2±2.0％）均未见统计学显着差异，但是切向值明显更大（7.0±2.4％）。数据表明，长骨中的牛皮质骨组织被设计成在径向和切向方向上比径向在径向上承受更高的载荷。此处得出的机械参数各向异性的可能解释可能是组织在三个测试方向上的结构。

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