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The epicenter method = CD/AB. The centre of rotation (point D) is defined by the center of the ulnar head and ulnar styloid process (point a and b, respectively). Point c is half the length of line ab. The crossing of the line, perpendicular to line AB and through point c, defines point D. The distance between point D and the midpoint of the sigmoid notch, point C, is measured. Wrist in supination
