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(a) Axis systems of the lower leg and IMU sensor. (b) Video image from camera 5: light-reflecting markers in extended standard marker setup for motion Test 6 One-Leg Squat. (c) Arrangement of the 8 cameras of the video-MA: top view, not exactly scaled; zoom cameras 3 and 8 for close-up; camera images show Test 2 Ankle dorsiflexion.
