Clinical Validation of Computer-Assisted Navigation in Total Hip Arthroplasty

Figure 3

Digitalized representation of an AP radiograph centered over the pelvis as well as the determination of the inclination and anteversion using the software Imagika 1.50. To determine the anteversion, the ratio of the major and minor ellipses was used, which corresponds to the dark portion of the cup using the method of Ackland. The inclination of the cup was determined by measuring the angle between a line joining the ischial tuberosities or the teardrops and a line through the long axis of the ellipse.