Zdero Rad, McConnell Alison J, Peskun Christopher, Syed Khalid A, Schemitsch Emil H
Martin Orthopaedic Biomechanics Laboratory, St. Michael's Hospital, 30 Bond Street, Toronto, Ontario, Canada.
J Biomech Eng. 2011 Jan;133(1):014501. doi: 10.1115/1.4002937.
The mechanical behavior of human femurs has been described in the literature with regard to torsion and tension but only as independent measurements. However, in this study, human femurs were subjected to torsion to determine if a simultaneous axial tensile load was generated. Fresh frozen human femurs (n=25) were harvested and stripped of soft tissue. Each femur was mounted rigidly in a specially designed test jig and remained at a fixed axial length during all experiments. Femurs were subjected to external and internal rotation applied at a constant angulation rate of 0.1 deg/s to a maximum torque of 12 N m. Applied torque and generated axial tension were monitored simultaneously. Outcome measurements were extracted from torsion-versus-tension graphs. There was a strong relationship between applied torsion and the resulting tension for external rotation tests (torsion/tension ratio=551.7±283.8 mm, R(2)=0.83±0.20, n=25), internal rotation tests (torsion/tension ratio=495.3±233.1 mm, R(2)=0.87±0.17, n=24), left femurs (torsion/tension ratio=542.2±262.4 mm, R(2)=0.88±0.13, n=24), and right femurs (torsion/tension ratio=506.7±260.0 mm, R(2)=0.82±0.22, n=25). No statistically significant differences were found for external versus internal rotation groups or for left versus right femurs when comparing torsion/tension ratios (p=0.85) or R(2) values (p=0.54). A strongly coupled linear relationship between torsion and tension for human femurs was exhibited. This suggests an interplay between these two factors during activities of daily living and injury processes.
关于人体股骨的力学行为，已有文献描述了其在扭转和拉伸方面的情况，但这些描述仅为独立测量。然而，在本研究中，对人体股骨施加扭转力，以确定是否会产生同时的轴向拉伸载荷。采集了25根新鲜冷冻的人体股骨，并去除其软组织。每根股骨被牢固地安装在一个专门设计的测试夹具中，在所有实验过程中保持固定的轴向长度。股骨以0.1度/秒的恒定角度速率进行外旋和内旋，直至达到12 N·m的最大扭矩。同时监测施加的扭矩和产生的轴向张力。从扭矩-张力图中提取结果测量值。在外旋测试中（扭矩/张力比=551.7±283.8 mm，R²=0.83±0.20，n=25）、内旋测试中（扭矩/张力比=495.3±233.1 mm，R²=0.87±0.17，n=24）、左侧股骨（扭矩/张力比=542.2±262.4 mm，R²=0.88±0.13，n=24）和右侧股骨（扭矩/张力比=506.7±260.0 mm，R²=0.82±0.22，n=25）中，施加的扭矩与产生的张力之间存在很强的关系。在比较扭矩/张力比（p=0.85）或R²值（p=0.54）时，外旋组与内旋组或左侧股骨与右侧股骨之间未发现统计学上的显著差异。人体股骨的扭转和张力之间呈现出强烈的耦合线性关系。这表明在日常生活活动和损伤过程中，这两个因素之间存在相互作用。
