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首页> 外文期刊>Journal of Biomechanics >Time dependent properties of bovine meniscal attachments: stress relaxation and creep.
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Time dependent properties of bovine meniscal attachments: stress relaxation and creep.

机译：牛半月板附件的时间依赖性：应力松弛和蠕变。

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It has been suggested that the success of a meniscal replacement is dependent on several factors, one of which is the secure fixation and firm attachment of the replacement to the tibial plateau [Chen, M.I., Branch, T.P., et al., 1996. Is it important to secure the horns during lateral meniscal transplantation? A cadaveric study. Arthroscopy 12(2), 174-181; Alhalki, M.M., et al., 1999. How three methods for fixing a medial meniscal autograft affect tibial contact mechanics. American Journal of Sports Medicine 27(3), 320-328; Haut Donahue, T.L., et al., 2003. How the stiffness of meniscal attachments and meniscal material properties affect tibio-femoral contact pressure computed using a validated finite element model of the human knee joint. Journal of Biomechanics 36(1), 19-34]. The complex loading environment in the knee lends itself to different loading environments for each meniscal attachment. We hypothesize that the creep and stress relaxation characteristics of the horn attachments will be different for the anterior versus posterior, and medial versus lateral attachments. To test this hypothesis, the stress relaxation and creep characteristics of the meniscal horn attachments were determined. The stress relaxation properties of load/stress at the end of the test, and the load/stress relaxation rate demonstrated no significant statistical differences between the attachments. Unlike the stress relaxation properties, the creep properties demonstrated some significant differences amongst the attachments. The normalized displacement at the end of the test, normalized creep rate and strain creep rate for the lateral anterior attachment were significantly different than those of the medial posterior attachment (p<0.05). The two anterior attachments had significantly different strains at the end of the test, as well as significantly different creep strain rates (p<0.05). The two attachments of the medial meniscus revealed no significant differences between any of the creep properties measured (p>0.05).The time dependent properties obtained in this experiment provide insight into the behavior of meniscal horn attachments under various loading situations. The results indicate that a suitable meniscal replacement may require different properties for the lateral and medial horns.
机译：已经提出，半月板置换的成功取决于几个因素，其中之一是置换固定在胫骨平台上的牢固固定和牢固附着[Chen，MI，Branch，TP，等，1996。半侧半月板移植期间确保角质重要吗？尸体研究。关节镜检查12（2），174-181; Alhalki，M.M。等，1999。固定内侧半月板自体移植物的三种方法如何影响胫骨接触力学。美国运动医学杂志27（3），320-328; Haut Donahue，T.L。等人，2003年。半月板附件的刚度和半月板材料特性如何影响使用人类膝关节经过验证的有限元模型计算出的胫股接触压力。生物力学学报36（1），19-34]。膝盖的复杂负荷环境使每个半月板附着物适应不同的负荷环境。我们假设，对于前部和后部，以及内侧和外侧的附件，角附件的蠕变和应力松弛特性会有所不同。为了验证该假设，确定了半月板角附件的应力松弛和蠕变特性。在测试结束时，载荷/应力的应力松弛特性以及载荷/应力的松弛率表明附件之间没有显着的统计差异。与应力松弛特性不同，蠕变特性在附件之间表现出一些显着差异。试验结束时的标准化位移，外侧前部附着物的标准化蠕变率和应变蠕变率与内侧后部附着物的差异有统计学意义（p <0.05）。在测试结束时，两个前附件的应变明显不同，蠕变应变率也显着不同（p <0.05）。内侧半月板的两个附件显示，所测量的任何蠕变特性之间均无显着差异（p> 0.05）。在该实验中获得的时间相关属性可提供对各种载荷情况下半月板角附件的行为的了解。结果表明，适当的半月板置换可能需要外侧和内侧角的不同属性。

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