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Axial computed tomography image of the distal radius showing a displaced fracture of the sigmoid notch (SN). Point A and B were marked at subchondral fracture margins of SN. First line was drawn between the dorsal corner of SN and point B. Second line through point A was perpendicular to first line. The intersection of two lines was point C. Step-off of SN was measured as the distance between point A and C. Gap displacement was measured as the distance between point B and C.
