Fig. 2

A Acetabular anteversion angle: schematic diagram of measuring theacetabular anteversion angle:the elliptical projection of the acetabular cup was drawn to measure the minor axis (a) and major axis (b) of the elliptical projection. B The schematic diagram of measuring the hip rotation center: g and g‘ are the vertical distances from the center of the femoral head on the line of connecting bilateral teardrops (X3); h and h‘ points are the intersection of g and g’ with X3; p and p’ are the lower edge of bilateral teardrops, hp and h’p’ are the horizontal distance of the hip rotation center. C Schematic diagram of measuring the leg length discrepancy. D Schematic diagram of measuring the femoral eccentric distance