Fig. 1From: Acetabular cup positioning in primary routine total hip arthroplasty—a review of current concepts and technologiesLumbosacral spine with pelvis lateral view showing normal spine with normal mobility (1A). a Pelvic tilt (APP = 13°), PI-LL (48.3°–53.1° = -4.8°). b, c ^SS > 10°Back to article page