Fig. 3From: Degenerative characteristics of multifidus at different vertebral levels of scoliosis in patients with degenerative lumbar scoliosis and relationship of these degenerative characteristics with surface electromyography activitySix bipolar electrodes were placed at three levels (UEV, AV, and LEV) of the bilateral MF. After confirmation by X-ray, the sEMG sensors and the inertial measurement unit (IMU) were placed in the appropriate areas. a The three sEMG sensors on the right side. b Left sEMG sensors, each integrated with an IMU, were placed at the corresponding positions of the spinous processes (L1, L3, and L5). c Three axes of the IMUBack to article page