Subject seated in a chair without arm rests, with feet fully resting on the floor, hips as far back in the chair as possible, and the hips and knees positioned at approximately 90°. Shoulder Adducted and neutrally rotated, elbow flexed to 90°, the forearm should be in midprone (neutral) and the Wrist Between 15 and 30° of extension (dorsiflexion) and 0–15° of ulnar deviation.