Prevalence of Focal (Superior) and Global (Central) Acetabular Retroversion in 538 Patients with Symptomatic Femoroacetabular Impingement and Hip Dysplasia - Lerch, T. D.; Schmaranzer, F.; Todorski, I.; Steppacher, S.; Siebenrock, K.; Tannast, M. (Seminars in Musculoskeletal Radiology, 2020)