A Development of a System to Measure Radioulnar Distance in Wrist-Joint Rotation Using Three-Dimensional Electromagnetic Sensor

For sports such as baseball and tennis, there are actions to throw the ball and swing the racket. There are cases injured the wrist joint by repeating this action. One such injury to the wrist joint is triangular fibrocartilage complex (TFCC) injury. TFCC is a part that keeps stability on the ulnar side of the wrist joint scale. So, if the TFCC is injured, the distance between the ulna and the radius will widen due to the wrist rotation, when the injury is severe, pain occurs on the ulnar side of the wrist joint. In the current diagnosis, there is no diagnosis to evaluate the change in distance between the ulna and the radius in the wrist rotation. Therefore, in this study, to quantitatively evaluate the change of distance between the ulna and the radius in TFCC injury, we develop a system to measure the distance between the ulna and the radius in the wrist rotation.