title: [The prevalence of reduced acetabular anteversion in asymptomatic patients: a retrospective analysis].
abstract: BACKGROUND
  In patients with unilateral femoroacetabular impingement (FAI), bony characteristics predisposing to FAI (e.g., acetabular retroversion) are also commonly observed in the contralateral asymptomatic hip. This study investigated the prevalence of these characteristics in an asymptomatic population and the influence of pelvic inclination and tilt on acetabular anteversion.
  
  
  METHODS
  In this study, patients with unspecific abdominal pain in whom CT including the hip was performed to aid diagnosis were included. Exclusion criteria were previous fractures of the acetabulum or the femur and surgical pretreatment of the hip. AV, CE angle, CCD angle and the distance between the anterior and posterior acetabular rims were determined.
  
  
  RESULTS
  11.5 % of the 400 included hip joints had a central AV of < 15°. A central retroversion was not found. Female patients had a significantly higher AV compared to males (p < 0.05). Pelvic tilt and inclination had a significant influence on the AV.
  
  
  CONCLUSIONS
  Correct assessment of AV is dependent on a correct pelvic radiograph. 16.5 % of the hips of asymptomatic patients had at least one bony characteristic predisposing to FAI.
authors.affiliation: Unfallchirurgische Klinik, Medizinische Hochschule Hannover. Hildebrand.Frank@mh-hannover.de
authors.forename: F
authors.initials: F
authors.lastname: Hildebrand
authors.forename: H-O
authors.initials: HO
authors.lastname: Shin
authors.forename: L
authors.initials: L
authors.lastname: Flötotto
authors.forename: C
authors.initials: C
authors.lastname: Krettek
authors.forename: T
authors.initials: T
authors.lastname: Gerich
mesh_terms: D000077:Acetabulum / Q000002:abnormalities* / Q000000981:diagnostic imaging*; D005260:Female; D057925:Femoracetabular Impingement / Q000000981:diagnostic imaging* / Q000453:epidemiology*; D005858:Germany / Q000453:epidemiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012307:Risk Factors; D014057:Tomography, X-Ray Computed / Q000706:statistics & numerical data*