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首页> 外文期刊>Journal of Biomechanics >Osteon interfacial strength and histomorphometry of equine cortical bone.
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Osteon interfacial strength and histomorphometry of equine cortical bone.

机译：马骨皮质骨的Osteon界面强度和组织形态学。

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摘要

The interfacial strength of secondary osteons from the diaphysis of the Thoroughbred equine third metacarpal was evaluated using the fiber pushout test. The pushout was performed on 300-500mum sections of 4x4x15mm bone blocks machined from four anatomic regions of the cortex. Pushout strength was evaluated from proximal to distal location within the diaphysis on four osteon types classified under polarized light on adjacent histologic sections from each block. The shear strength of the interfaces were estimated from shear lag theory. Differences were found in the interfacial strength of osteons based on appearance under polarized light with bright field having the highest interfacial strength (40.3MPa). The lowest strength was found in the dark field osteons (22.8MPa). The dorsal region had the highest shear strength and toughness compared to all other regions. The cement line and interlamellar interfaces are similar in strength, but exhibit regional dependence-specifically, the palmar region strength is less (17.5MPa) than the osteon interlamellar interfaces (30.4MPa) and osteon type dependent (alternating significantly weaker than other types). Histomorphometry revealed significant regional differences (p<0.0001) in osteon area fraction among the four osteon types as well as differences in the osteon diameter (p=0.01), with dorsal regions having larger osteons (170mum) than the palmar region (151mum). Fatigue life and fracture toughness of Haversian bone are reported in the literature to be regionally dependent and are known to be associated with osteon pullout-an osteon interfacial phenomenon. Therefore, the results presented in this study are important to further the understanding of the mechanisms of fragility and damage accumulation in cortical bone.
机译：使用纤维推出试验评估了纯种马第三掌骨的骨干的次生骨的界面强度。在从皮质的四个解剖区域加工出的300x-500毫米的4x4x15mm骨块切片上执行推出。在每个骨块的相邻组织切片上，在偏振光下分类的四种骨类型，从骨干中的近端到远端位置评估了推出强度。根据剪切滞后理论估算界面的剪切强度。基于在具有最高界面强度（40.3MPa）的亮场的偏振光下的外观，发现了骨质的界面强度的差异。在暗场骨中发现最低的强度（22.8MPa）。与所有其他区域相比，背部区域具有最高的剪切强度和韧性。骨水泥层和层间界面的强度相似，但具体表现出区域依赖性，手掌区域的强度（17.5MPa）小于骨间层界面（30.4MPa）和骨类型的依赖性（交替性明显弱于其他类型）。组织形态计量学揭示了四种骨类型之间骨面积分数的显着区域差异（p <0.0001），以及骨直径的差异（p = 0.01），背侧区域比掌骨区域（151mum）具有更大的骨（170mum）。在文献中，哈弗骨的疲劳寿命和断裂韧性据报道是局部性的，并且与骨质拔出（一种骨质界面现象）有关。因此，本研究提出的结果对于进一步了解皮质骨的脆性和损伤累积机制很重要。

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