Lass P, Kaalund S, leFevre S, Arendt-Nielsen L, Sinkjaer T, Simonsen O
Department of Orthopedics, Aalborg Hospital, Denmark.
Acta Orthop Scand. 1991 Feb;62(1):9-14. doi: 10.3109/17453679108993083.
In an electromyographic (EMG) study, the coordination in muscles acting on the knee joint was assessed in 14 patients with an arthroscopically verified complete rupture of the anterior cruciate ligament and in 16 controls. EMG and heel-contact signals were recorded while walking on a treadmill at walking gradients from 0 to 25 percent. There was an earlier onset of EMG bursts in the patients, especially in the lateral hamstrings and medial gastrocnemius; and the duration of EMG bursts also tended to be prolonged in the patients. Normalized root mean squares of amplitudes, which correlate with muscle tension, were higher in the gastrocnemius in the patients. EMG profiles, outlining the averaged muscle activity throughout the gait cycle, showed a displacement of peak activity in the hamstrings from the late swing phase into the stance phase, with increasing gradients in both the patients and the controls. Our study indicates that the gastrocnemius muscle contributes to functional stability in the anterior cruciate ligament deficient knee, and more attention should be paid to this muscle.
在一项肌电图（EMG）研究中，对14例经关节镜证实前交叉韧带完全断裂的患者和16名对照组人员的膝关节作用肌协调性进行了评估。在跑步机上以0%至25%的步行坡度行走时记录肌电图和足跟接触信号。患者的肌电爆发起始更早，尤其是在股二头肌外侧头和腓肠肌内侧头；患者的肌电爆发持续时间也往往更长。与肌肉张力相关的标准化均方根振幅在患者的腓肠肌中更高。描绘整个步态周期平均肌肉活动的肌电图显示，随着坡度增加，患者和对照组的腘绳肌峰值活动均从摆动晚期向站立期位移。我们的研究表明，腓肠肌有助于前交叉韧带损伤膝关节的功能稳定性，应更多关注该肌肉。
