Fig. 1

Example data from (A) one healthy control and B preoperative and C postoperative testing from one VS subject in the “Standing-on-foam-eyes-closed” balance stabilization exercise, during which subjects were required to stand on a rectangular foam (15.5 × 12.5 × 2.4 inches) with their feet together and their eyes closed. The gold 3D scatter plots and time series show the head linear acceleration in 3 axes of translation (fore-aft, lateral, and vertical). The purple 3D scatter plots and time series show the head angular velocity in 3 axes of rotation (roll, pitch, and yaw)