“…The orientation of the acetabular cup remains a major challenge in total hip arthroplasty (THA) (Lewinnek, et al 1978) . New tools are continuously developed to allow orthopaedic surgeons to measure clinical parameters and assist them in their task (Dardenne, et al 2009) (Rivière, et al 2018). The sterEOS planning software developed by EOS Imaging® allows, from EOS images, the three dimensional measurement of several pelvic parameters useful in total hip arthroplasty (THA): the acetabulum inclination and anteversion, the femoral head diameter, the offset, the femoral neck length, the CCD angle, the femur torsion, the pelvic incidence, the sacral slope, the pelvic version, the pelvic obliquity, the pelvis axial rotation and the anterior pelvic plane (APP) inclination.…”