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首页> 外文期刊>Journal of orthopaedic research >Effect of increased quadriceps tensile stiffness on peak anterior cruciate ligament strain during a simulated pivot landing
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Effect of increased quadriceps tensile stiffness on peak anterior cruciate ligament strain during a simulated pivot landing

机译：股四头肌拉伸刚度增加对模拟枢轴着陆过程中前十字韧带峰值的影响

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摘要

ACL injury prevention programs often involve strengthening the knee muscles. We posit that an unrecognized benefit of such training is the associated increase in the tensile stiffness of the hypertrophied muscle. We tested the hypothesis that an increased quadriceps tensile stiffness would reduce peak anteromedial bundle (AM-)ACL relative strain in female knees. Twelve female cadaver knees were subjected to compound impulsive two-times body weight loads in compression, flexion, and internal tibial torque beginning at 15° flexion. Knees were equipped with modifiable custom springs to represent the nonlinear rapid stretch behavior of a normal and increased stiffness female quadriceps (i.e., 33% greater stiffness). Peak AM-ACL relative strain was measured using an in situ transducer while muscle forces and tibiofemoral kinematics and kinetics were recorded. A 3D ADAMS? dynamic biomechanical knee model was used in silico to interpret the experimental results which were analyzed using a repeated-measures Wilcoxon test. Female knees exhibited a 16% reduction in peak AM-ACL relative strain and 21% reduction in change in flexion when quadriceps tensile stiffness was increased by 33% (mean (SD) difference: 0.97% (0.65%), p = 0.003). We conclude that increased quadriceps tensile stiffness reduces peak ACL strain during a controlled study simulating a pivot landing.
机译：ACL伤害预防计划通常包括加强膝盖肌肉。我们认为，这种训练无法识别的益处是肥大肌肉的拉伸僵硬性相关的增加。我们测试了以下假设：增加股四头肌的拉伸刚度会降低女性膝盖的峰值前内侧束（AM-）ACL相对应变。从15°屈曲开始，十二个女性尸体膝盖在压缩，屈曲和内部胫骨扭矩中承受两倍的复合脉冲体重载荷。膝盖装有可修改的定制弹簧，以代表正常的和增加刚度的女性股四头肌的非线性快速拉伸行为（即，刚度增加了33％）。使用原位传感器测量AM-ACL峰值相对应变，同时记录肌肉力以及胫股运动学和动力学。 3D ADAMS？在计算机上使用动态生物力学膝关节模型来解释实验结果，并使用重复测量Wilcoxon检验进行分析。当股四头肌的拉伸刚度提高33％时，女性膝盖的AM-ACL峰值相对应变降低16％，屈曲变化降低21％（平均（SD）差异：0.97％（0.65％），p = 0.003）。我们得出的结论是，在模拟枢轴着陆的受控研究中，增加股四头肌的拉伸刚度会降低峰值ACL应变。

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