Grabiner M D, Weiker G G
Department of Biomedical Engineering, The Research Institute, The Cleveland Clinic Foundation, OhioUSA.
Clin Biomech (Bristol). 1993 Jul;8(4):215-9. doi: 10.1016/0268-0033(93)90017-C.
Two experiments were conducted to determine whether injury to the anterior cruciate ligament influences coactivation patterns of the hamstrings during voluntary isometric knee extension. Normal patterns of hamstrings coactivation were established in a control group during submaximum and maximum effort isometric knee extension torque at two knee flexion angles. Subjects who had undergone anterior cruciate ligament reconstructive surgery and a group of conservatively managed patients were studied using a modified protocol. It was predicted that (a) hamstrings coactivation patterns would vary significantly as a function of knee flexion angle, and (b) control and anterior cruciate ligament reconstructed subjects would differ significantly from the anterior cruciate ligament deficient subjects. Contrary to expectations, (a) hamstrings coactivation patterns were not significantly related to knee joint angle for any of the three groups, and (b) differences between hamstrings coactivation patterns of the anterior cruciate ligament deficient and anterior cruciate ligament reconstructed groups were not significant. The hamstrings coactivation pattern of the combined anterior cruciate ligament group data was significantly different from control patterns and characterized by significantly higher hamstrings coactivation. The coactivation may increase knee joint stability/stiffness and may be a beneficial adaptation to the injury-related knee joint instability. The long-term effect of this adaptation on knee joint function is unknown.
进行了两项实验，以确定前交叉韧带损伤是否会影响在自愿等长膝关节伸展过程中腘绳肌的共同激活模式。在一个对照组中，于两个膝关节屈曲角度下，在次最大和最大努力等长膝关节伸展扭矩期间建立了腘绳肌共同激活的正常模式。使用改良方案对接受前交叉韧带重建手术的受试者和一组保守治疗的患者进行了研究。预计（a）腘绳肌共同激活模式会因膝关节屈曲角度而有显著差异，且（b）对照组和前交叉韧带重建受试者与前交叉韧带损伤受试者会有显著差异。与预期相反，（a）三组中任何一组的腘绳肌共同激活模式均与膝关节角度无显著相关性，且（b）前交叉韧带损伤组和前交叉韧带重建组的腘绳肌共同激活模式之间的差异不显著。前交叉韧带组综合数据的腘绳肌共同激活模式与对照组模式显著不同，其特征是腘绳肌共同激活显著更高。这种共同激活可能会增加膝关节稳定性/刚度，并且可能是对与损伤相关的膝关节不稳定的一种有益适应。这种适应对膝关节功能的长期影响尚不清楚。
