Effects of Non-Destructive Overloading on the Mechanical Properties, Microstructure and Ultrastructure of Rabbit Patellar Tendons
Effects of Non-Destructive Overloading on the Mechanical Properties, Microstructure and Ultrastructure of Rabbit Patellar Tendons
复制标题
无损过载对兔髌腱力学性能、显微结构和超微结构的影响
DOI：
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
K. Ohta
中科院分区：
文献类型：
--
作者：
E. Yamamoto;K. Ohta
肌腱的不完全或亚失效损伤比完全断裂更常见。然而，不完全损伤组织的力学行为知之甚少。在本研究中，我们量化的机械性能，显微结构和超微结构的兔髌腱进行非破坏性超载。在低应变率（1.67%/sec）下，施加相当于控制钢筋束失效应力80%的亚失效拉伸的钢筋束样本中，未观察到力学性能的显著变化。有一个显着的下降，而不是在拉伸强度，但在切线模量的标本时，他们受到90%的控制破坏应力在低速率。在高应变速率（16.7%/sec）下，相同超载水平下，超载试件的模量和强度均显著低于对照试件。在微观结构上，无论应变率如何，90%的过载都会使过载肌腱中卷曲的胶原纤维变直。相反，在超微结构的不良改变，诱导的90%过载只有在高利率。这些结果表明，肌腱组织有潜在的能力，以保持原来的强度，如果一个相对较高的过载是单调地施加在较低的应变率。然而，它是可能的，在较高的应变速率下传递的亚失效过载产生更严重的变化，在性质和结构的组织。
Incomplete or subfailure injuries of tendons occur more frequently than their complete ruptures. However, the mechanical behavior of the incompletely injured tissues is poorly understood. In the present study, we quantified the mechanical properties, microstructure, and ultrastructure of rabbit patellar tendons subjected to non-destructive overloading. No significant changes in the mechanical properties were observed in the tendon specimens which were applied a subfailure stretch equivalent to 80% of the failure stress of the control tendons at a low strain rate (1.67 %/sec). There was a significant decrease not in the tensile strength but in the tangent modulus of the specimens when they were subjected to 90% of the control failure stress at the low rate. For the same level of overloading at a high strain rate (16.7 %/sec), both the modulus and strength of the overloaded specimens were significantly lower than those of the control ones. Microstructually, irrespective of the strain rate, crimped collagen fibers in the overloaded tendons were straightened by the 90% overloading. In contrast, adverse alterations in the ultrastructure were induced by the 90% overloading only at the high rate. These results indicate that tendinous tissues have potential capacities to maintain the original strength if a relatively high overload is monotonically applied at lower strain rates. However, it is possible that subfailure overloads delivered at higher strain rates produce more severe changes in the properties and structures of the tissues.
影响因子：
2.4
作者：
BUTLER, DL;KAY, MD;STOUFFER, DC
通讯作者：
STOUFFER, DC
兔前十字韧带高速亚失效拉伸：弹性、失效和粘弹性特性的变化。
DOI：
10.1016/s0268-0033(01)00007-9
发表时间：
2001
期刊：
Clinical biomechanics (Bristol, Avon)
影响因子：
--
作者：
Panjabi,MM;Courtney,TW
通讯作者：
Courtney,TW
影响因子：
2.4
作者：
Juncosa, N;West, JR;Butler, DL
通讯作者：
Butler, DL