The paraspinal muscles of ten patients with adolescent idiopathic scoliosis (AIS) and four normal healthy controls were investigated electromyographically during standing and locomotion. None of the controls and only three of the scoliotics showed EMG activity while standing. During locomotion, six patients showed a predominance of myoelectric activity on the convexity of the curve. This data suggests that bilateral muscle imbalances in patients with scoliosis are more readily distinguished by electromyography during locomotion than while standing. Furthermore, this study confirms previous reports that show a predominance of muscle activity on the convexity of the curvature in idiopathic scoliosis.
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