title: Relationship between acetabular labrum evaluation by using radial magnetic resonance imaging and progressive joint space narrowing in mild hip dysplasia.
abstract: OBJECTIVE
  The aim of this study was to investigate the relationship between abnormal acetabular labrum depicted by radial magnetic resonance and progressive joint space narrowing (JSN) of hip dysplasia.
  
  
  METHODS
  Subjects were 23 joints [21 patients; mean age: 35.1 years (16-53 years)] that had acetabular dysplasia with lateral center-edge angle of Wiberg (CE angle) greater than 5 degrees and smaller than 25 degrees (mean, 16.4 degrees ), which did not show any arthrotic changes on plain radiograms and were followed up for 3 years or longer. Radial images of acetabular labrum were classified into three stages.
  
  
  RESULTS
  Progression of JSN was not significantly related to CE angle but to progression of MRI stage (P=.006). In multivariate analysis, one rank progression of MRI stage was significantly associated with progression of JSN (adjusted OR=11.41, 95% CI: 1.51-86.24, P=.018).
  
  
  CONCLUSIONS
  Our findings showed that in patients whose acetabular dysplasia has 5-25 degrees CE angle, MRI staging based on radial MRI is a better factor for prediction of progression of JSN than CE angle.
authors.affiliation: Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan.
authors.forename: Keiichiro
authors.initials: K
authors.lastname: Ueshima
authors.forename: Kenji A
authors.initials: KA
authors.lastname: Takahashi
authors.forename: Mikihiro
authors.initials: M
authors.lastname: Fujioka
authors.forename: Yuji
authors.initials: Y
authors.lastname: Arai
authors.forename: Motoyuki
authors.initials: M
authors.lastname: Horii
authors.forename: Takeshi
authors.initials: T
authors.lastname: Asano
authors.forename: Tetsurou
authors.initials: T
authors.lastname: Hirata
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Suehara
authors.forename: Takashi
authors.initials: T
authors.lastname: Tanaka
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Kubo
mesh_terms: D000077:Acetabulum / Q000473:pathology*; D000293:Adolescent; D000328:Adult; D018450:Disease Progression; D005260:Female; D006617:Hip Dislocation / Q000473:pathology*; D006621:Hip Joint / Q000473:pathology*; D006801:Humans; D007593:Joint Instability / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000473:pathology*