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Quasi-static tensile properties of the Cranial Cruciate Ligament (CrCL) in adult cattle: towards the design of a prosthetic CrCL
Journal of the Mechanical Behavior of Biomedical Materials ( IF 3.9 ) Pub Date : 2017-12-26 , DOI: 10.1016/j.jmbbm.2017.12.024
Lucien Diotalevi , Yvan Petit , Vladimir Brailovski , Sylvain Nichols , Emma Marchionatti , Éric Wagnac

Mechanical properties of the Cranial Cruciate Ligament (CrCL) in adult cattle are not well documented and protocols used in the literature focus on testing a full femur-CrCL-tibia complex rather than an isolated CrCL. The aim of this study was to assess a wider range of tensile properties of the CrCL along its anatomic axis with experimental measurements of the global elongation, displacement and strain fields, in order to provide guidelines for the design of CrCL prosthetic surrogates. Fourteen bovine CrCL were harvested from seven mature cows (5.1 ± 1.3 years) weighing 631 ± 90 kg. The mean CrCL length was 41.4 ± 1.5 mm and its mean cross-section was 103.9 ± 23.8 mm2. Pre-conditioning was achieved with 30 cycles of loading from 30 to 200 N at a strain rate of 0.02 s−1. Specimens were then loaded to failure at the same strain rate. The following results were obtained: the mean ultimate tensile load (UTL) 4372 ± 1485 N and the median [quartiles] maximal global elongation 19.3 [17.8; 21.4] %. At first physical signs of tearing, the mean load was 3315 ± 1336 N and mean elongation 13.5 ± 4.9%. The mean absorbed energy at failure was 5.23 ± 2.08 MJ.m m−3 and the mean stiffness at various levels of elongation was: 220 ± 195 N.%−1 (5%), 285 ± 162 N.%−1 (10%), 239 ± 200 N.%−1 (15%), 146 ± 59 N.%−1 (20%), 153 ± 136 N.%−1 (25%). None of these properties were related to the bovine weight, age and side of the body (p > 0.05). An ideal prosthetic surrogate should then follow these sets of properties and the experimental data suggest that the in-vivo maximal elongation is below 13.5%.



中文翻译:

成年牛的颅交叉韧带(CrCL)的准静态拉伸性能:修复CrCL的设计

成年牛的颅骨交叉韧带(CrCL)的机械性能尚未得到充分记录,文献中使用的协议侧重于测试完整的股骨-CrCL-胫骨复合体,而不是单独的CrCL。这项研究的目的是通过对整体伸长率,位移和应变场的实验测量来评估CrCL沿其解剖轴的更广泛的拉伸性能,从而为CrCL假体替代物的设计提供指导。从7头重631±90公斤的成年母牛(5.1±1.3岁)收获了十四只牛CrCL。CrCL的平均长度为41.4±1.5 mm,平均横截面为103.9±23.8 mm 2。通过以0.02 s -1的应变速率从30到200 N的30个加载循环实现预处理。然后以相同的应变率将样品加载至破坏。获得以下结果:平均极限拉伸载荷(UTL)4372±1485 N和中值[四分位数]最大总伸长率19.3 [17.8; 21.4]%。最初出现撕裂的物理迹象时,平均载荷为3315±1336 N,平均伸长率为13.5±4.9%。破坏时的平均吸收能量为5.23±2.08 MJ.m m -3,并且在各种伸长水平下的平均刚度为:220±195 N.%- 1(5%),285±162 N.%- 1(10% ),239±200 N.%- 1(15%),146±59 N.%- 1(20%),153±136 N.%- 1(25%)。这些特性均与牛的体重,年龄和身体侧面无关(p> 0.05)。然后,理想的假体替代物应遵循以下几组特性,并且实验数据表明,体内最大伸长率低于13.5%。

更新日期:2017-12-26
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