Reese Shawn P, Weiss Jeffrey A
J Biomech Eng. 2013 Mar 1;135(3):34501. doi: 10.1115/1.4023134.
The underlying mechanisms for the viscoelastic behavior of tendon and ligament tissue are poorly understood. It has been suggested that both a flow-dependent and flow-independent mechanism may contribute at different structural levels. We hypothesized that the stress relaxation response of a single tendon fascicle is consistent with the flow-dependent mechanism described by the biphasic theory (Armstrong et al., 1984, "An Analysis of the Unconfined Compression of Articular Cartilage," ASME J. Biomech. Eng., 106, pp. 165-173). To test this hypothesis, force, lateral strain, and Poisson's ratio were measured as a function of time during stress relaxation testing of six rat tail tendon fascicles from a Sprague Dawley rat. As predicted by biphasic theory, the lateral strain and Poisson's ratio were time dependent, a large estimated volume loss was seen at equilibrium and there was a linear correlation between the force and Poisson's ratio during stress relaxation. These results suggest that the fluid dependent mechanism described by biphasic theory may explain some or all of the apparent viscoelastic behavior of single tendon fascicles.
肌腱和韧带组织的粘弹性行为的潜在机制仍知之甚少。有人提出，与流动相关和与流动无关的机制可能在不同的结构层面发挥作用。我们假设单个肌腱束的应力松弛反应与双相理论（阿姆斯特朗等人，1984年，《关节软骨无侧限压缩分析》，美国机械工程师协会《生物力学工程杂志》，第106卷，第165 - 173页）所描述的与流动相关的机制一致。为了验证这一假设，在对一只斯普拉格 - 道利大鼠的六条大鼠尾肌腱束进行应力松弛测试期间，测量了力、横向应变和泊松比随时间的变化。正如双相理论所预测的，横向应变和泊松比随时间变化，在平衡时观察到大量估计的体积损失，并且在应力松弛过程中力和泊松比之间存在线性相关性。这些结果表明，双相理论所描述的与流体相关的机制可能解释了单个肌腱束的部分或全部明显的粘弹性行为。
