title: Normal values of Wiberg's lateral center-edge angle and Lequesne's acetabular index--a coxometric update.
abstract: BACKGROUND
  The historical pathological cut-off values for Wiberg's lateral center-edge (LCE) angle and Lequesne's acetabular index (AI) are below 20° and above 12° for the LCE and AI, respectively. The aim of this study was to reassess these two angles more than 50 years after their introduction using a standardized conventional radiological measurement method, considering changing social habits and their associated physiological changes.
  
  
  METHODS
  A total of 1,226 anteroposterior radiographs of the pelvis (2,452 hips) were obtained according to a strict standardized radiographic technique allowing reliable measurements of the LCE angle and the AI.
  
  
  RESULTS
  Distributions of the LCE and AI were pronouncedly Gaussian, with mean values of 33.6° for the LCE and 4.4° for the AI. The 2.5th and 97.5th empirical percentiles were 18.1 and 48.0° for the LCE and -6.9 and 14.9° for the AI. These intervals contained 95 % of the data in our large sample. Small but statistically significant differences between the sexes and right and left hips have been demonstrated. Correlation between age and coxometric indices was low.
  
  
  CONCLUSIONS
  The above findings do not conflict with the historical benchmarks. Statistical differences between sexes and between right and left hips were not clinically relevant. No conclusion can be drawn about coxometric indices and clinical manifestations of hip dysplasia.
authors.affiliation: Division of Trauma Surgery, University Hospital Zurich, Raemistrasse 100, 8091 Zürich, Switzerland. cwerner@gmx.ch
authors.forename: Clément M L
authors.initials: CM
authors.lastname: Werner
authors.forename: Leonhard E
authors.initials: LE
authors.lastname: Ramseier
authors.forename: Thomas
authors.initials: T
authors.lastname: Ruckstuhl
authors.forename: Jeff
authors.initials: J
authors.lastname: Stromberg
authors.forename: Carol E
authors.initials: CE
authors.lastname: Copeland
authors.forename: Clifford H
authors.initials: CH
authors.lastname: Turen
authors.forename: Kaspar
authors.initials: K
authors.lastname: Rufibach
authors.forename: Samy
authors.initials: S
authors.lastname: Bouaicha
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging*; D000293:Adolescent; D000328:Adult; D000368:Aged; D006617:Hip Dislocation / Q000000981:diagnostic imaging*; D006621:Hip Joint / Q000000981:diagnostic imaging*; D006801:Humans; D008875:Middle Aged; D012016:Reference Values; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013557:Switzerland; D014057:Tomography, X-Ray Computed / Q000592:standards*; D055815:Young Adult