A device including a frame, that is designed to be attached to a stationary structure element, at least one member for applying the forces produced by the patient, mounted on the frame and free to rotate about an axis of rotation that is fixed relative to the frame, a force sensor that measures, in a direction radial to the axis of rotation, the traction component of the forces applied to the member, and an angle sensor that measures the angular positioning of the member about the axis of rotation.
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