Fig. 1

a Depiction of the method of Liaw et al. The β angle is used to calculate the anteversion. b Depiction of the method of Lewinnek et al. The long and short axes of the ellipse are used to calculate the anteversion. c Depiction of Widmer’s method. The short axis of the ellipse and total length of the acetabular component are used to calculate the anteversion. d Depiction of the method of Hassan et al. The long axis of ellipse and the head edge are used to calculate anteversion. e Depiction of the method of Ackland et al. Each perpendicular distance from the end of the ellipse to the cross section between the tangent and the diametrical line is used to calculate the anteversion. f Depiction of the method of Woo and Morrey. The cross-table lateral radiograph is used to calculated the anteversion