Inoue M, Yasuda K, Yamanaka M, Wada T, Kaneda K
Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Sapporo, Japan.
Am J Sports Med. 1998 Sep-Oct;26(5):710-4. doi: 10.1177/03635465980260051801.
We performed electromyographic analyses in 12 patients with posterior cruciate ligament-deficient knees to compare electrical activity in the quadriceps, hamstring, and gastrocnemius muscles between the uninjured and involved limbs. Each patient performed concentric isokinetic knee motion at 30 and 60 deg/sec in both limbs separately. Torques in knee extension and flexion and surface electromyograms from the quadriceps, medial hamstring, and medial gastrocnemius muscles were simultaneously recorded. The uninjured limb served as a control for each patient. Before generation of flexion torque, the gastrocnemius muscle was electrically activated significantly earlier in posterior cruciate ligament-deficient knees than in uninjured knees at each velocity. However, we could not find any significant differences between the posterior cruciate ligament-deficient and uninjured knees in torque curves and electromyelograms of the quadriceps and hamstring muscles. This study suggests that early contraction of the gastrocnemius muscle may be a part of a compensatory mechanism in posterior cruciate ligament-deficient knees.
我们对12名后交叉韧带损伤的膝关节患者进行了肌电图分析，以比较健侧和患侧肢体的股四头肌、腘绳肌和腓肠肌的电活动。每位患者分别在双下肢以30度/秒和60度/秒的速度进行同心等速膝关节运动。同时记录膝关节伸展和屈曲时的扭矩以及股四头肌、腘绳肌内侧和腓肠肌内侧的表面肌电图。健侧肢体作为每位患者的对照。在产生屈曲扭矩之前，在每个速度下，后交叉韧带损伤的膝关节中腓肠肌的电激活明显早于健侧膝关节。然而，我们发现在后交叉韧带损伤的膝关节与健侧膝关节之间，股四头肌和腘绳肌的扭矩曲线和肌电图没有任何显著差异。这项研究表明，腓肠肌的早期收缩可能是后交叉韧带损伤膝关节代偿机制的一部分。
