保存療法を行った肩鎖関節脱臼患者の挙上運動における肩甲骨周囲筋活動

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The clinical result of non-operative treatment of acromioclavicular (AC) dislocation is usually satisfactory. But sometimes, pain and functional impairment remain. The object of this study is to estimate the pathology by electromyographic analysis in patients suffering from AC dislocation. EMG activities of upper, middle, and inferior trapezius muscle, anterior, middle, and posterior deltoid muscle, and serratus anterior, were examined in 5 static positions from 0° to 120° for 5 seconds in each position during exercises of shoulder flexion and abduction in patients suffering from AC dislocation. We used Telemyo System 2400 (Noraxon USA Inc) and analyzed by MyoVideo and MyoResearch. The relative activity of upper trapezius muscle did not increase during abduction. The relative activity of middle trapezius muscle gradually increased during the early phase of abduction. The relative activity of inferior trapezius muscle in abduction did not increase. The relative activities in each muscle during flexion were similar to the asymptomatic sides shoulder. This study shows that inhibition of the activity of upper trapezius muscle during abduction prevented the clavicle from elevating.