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(A) Hip with ankylosing spondylitis and severe pelvic posterior tilt. Radiographic orientation, measured using the functional coronal plane, was in 13.4° of anteversion. (B) Hip with ankylosing spondylitis and severe pelvic posterior tilt. Radiographic orientation, measured using the APP as the coronal plane, was in 10.2° of retroversion. RA = radiographic anteversion; COP = cup opening plane.
