title: Pelvic tilt compensates for increased acetabular anteversion.
abstract: Pelvic tilt determines functional orientation of the acetabulum. In this study, we investigated the interaction of pelvic tilt and functional acetabular anteversion (AA) in supine position.
  
  
  
  Pelvic tilt and AA of 138 individuals were measured by computed tomography (CT). AA was calculated in relation to the anterior pelvic plane (APP) and relative to the table plane. We analysed these parameters for gender-specific and age-related differences.
  
  
  
  The mean pelvic tilt was -0.1 ± 5.5°. Pelvic sagittal rotation displayed no gender nor age related differences. Females showed higher angles of AA compared with males (20.0° vs 17.2°, p < 0.001; AA relative to the APP). Anterior tilting of the pelvis positively correlated with AA and individuals with high AA had a higher anterior pelvic tilt compared with those with low AA (p < 0.0001; AA relative to the APP).
  
  
  
  AA has to be calculated regarding pelvic sagittal rotation for correct acetabular orientation. Pelvic tilt is dependent on acetabular orientation and compensates for increased AA.
authors: Centre for Musculoskeletal Surgery, Department for Orthopaedics, Department for Traumatology, Charité-University Medicine Berlin, Charitéplatz 1, 10117, Berlin, Germany. Robert.zahn@charite.de.
authors: Robert K
authors: RK
authors: Zahn
authors: Centre for Musculoskeletal Surgery, Department for Orthopaedics, Department for Traumatology, Charité-University Medicine Berlin, Charitéplatz 1, 10117, Berlin, Germany.
authors: Sarah
authors: S
authors: Grotjohann
authors: Visualization & Data Analysis Medical Planning & Computational Medicine Groups, Zuse Institute Berlin (ZIB), Takustraße 7, 14195, Berlin, Germany.
authors: Heiko
authors: H
authors: Ramm
authors: Visualization & Data Analysis Medical Planning & Computational Medicine Groups, Zuse Institute Berlin (ZIB), Takustraße 7, 14195, Berlin, Germany.
authors: Stefan
authors: S
authors: Zachow
authors: Centre for Musculoskeletal Surgery, Department for Orthopaedics, Department for Traumatology, Charité-University Medicine Berlin, Charitéplatz 1, 10117, Berlin, Germany.
authors: Michael
authors: M
authors: Putzier
authors: Centre for Musculoskeletal Surgery, Department for Orthopaedics, Department for Traumatology, Charité-University Medicine Berlin, Charitéplatz 1, 10117, Berlin, Germany.
authors: Carsten
authors: C
authors: Perka
authors: Department for Orthopaedics and Traumatology, HELIOS Klinikum Emil von Behring, Oskar-Helene-Heim, Walterhöferstraße 11, 14165, Berlin, Germany.
authors: Stephan
authors: S
authors: Tohtz
mesh_terms: D000077:Acetabulum / Q000473:pathology* / Q000601:surgery; D019644:Arthroplasty, Replacement, Hip; D005260:Female; D006801:Humans; D008297:Male; D010388:Pelvis; D012399:Rotation; D014057:Tomography, X-Ray Computed
keywords: Acetabular anteversion; Acetabular orientation; Pelvic tilt; Spino-pelvic balance