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An AP radiograph of the pelvis of a male patient shows a hip replacement with a superior and medialized hip center (CA). The positions of the actual (CA) and normal (CN) hip centers are shown. The actual CxA/Dx is high and the CyA/Dy is low compared with the normal male Cx/Dx (9.9%) and Cy/Dy (31.7%). The latter were used to derive the normal position of the hip center (CxN, CyN). Cx,Cy,Cz = x-, y- and z-coordinates of the hip center; Dx,Dy,Dz = x-, y- and z-dimensions of the pelvis.
