Estimation of Optimal Mount Positions of Inertial Sensor for Motion Analysis of Thigh and Crus

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Estimation method of optimal mount positions of inertial sensor for thigh and crus is described. These positions are estimated by calculating the movement of reflective markers placed on the skin with relative to femoral or tibial coordinate system. A Point Cluster Method that derives limb segment motion using plural reflective markers is employed to calculation the movement of markers on the limbs. The movement of markers is evaluated as displacement and rotation, and the marker position where these values are minimum is estimated as optimal mount position. Five experimental movements assuming physical exercise were given to five subjects: flexion/extension of knee, counterclockwise rotation of waist (external rotation of tibia), clockwise rotation of waist (internal rotation of tibia), flexion of knee medially (flexion of knee and valgus of tibia and ext.rot. of tibia), and flexion of knee laterally (flexion of knee and varus of tibia and int.rot. of tibia). The experimental results show that estimated optimal mount positions are middle position of anterior aspect of thigh and inferior position of anterior aspect of crus.