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Standing (left image) and sitting (right image) lateral radiographs. Note increased pelvic tilt with corresponding acetabular rollback (increased anteversion) when transitioning from standing to sitting. From: 39. Stefl M, Lundergan W, Heckmann N, et al. Spinopelvic mobility and acetabular component position for total hip arthroplasty. Bone Joint J. 2017; 99-B(1 Supple A):37–45
