title: Predictive factors for acetabular labral lesions in osteoarthritis of the hip with radial magnetic resonance imaging--a cross-sectional study.
abstract: OBJECTIVE
  To document the reliability of Abe's classification and to clarify the predictive factors for acetabular labral lesions in osteoarthritis of the hip with radial magnetic resonance (MR) imaging.
  
  
  METHODS
  Reliability trial for the classification of acetabular labral lesion was performed by six orthopedic surgeons, grading 20 radial MR images in a blinded fashion at an interval of 4-5 weeks. Radial MR images of 275 hips in 263 patients were prospectively analyzed to determine the relationship between acetabular labral lesions, their distribution, age, and the acetabular coverage.
  
  
  RESULTS
  Cohen's quadratic weighted kappa of inter-observer reliability was 0.784 for the grade and 0.812 for the shape category. The weighted kappa of intra-observer reliability was 0.852 for the grade and 0.90 for the shape category. Multiple regression analysis revealed that both the grade and the shape were associated with age, acetabular coverage, and location of the labrum.
  
  
  CONCLUSIONS
  Abe's classification of labral lesions was reliable for both the grade and shape categories. Aging, acetabular dysplasia, and the anterosuperior portion would be predictive factors for degeneration of the acetabular labrum using radial MR imaging.
authors.affiliation: Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University , Chiba , Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Takazawa
authors.forename: Junichi
authors.initials: J
authors.lastname: Nakamura
authors.forename: Isao
authors.initials: I
authors.lastname: Abe
authors.forename: Seiji
authors.initials: S
authors.lastname: Ohtori
authors.forename: Atsuya
authors.initials: A
authors.lastname: Watanabe
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Sato
authors.forename: Takahisa
authors.initials: T
authors.lastname: Sasho
authors.forename: Sumihisa
authors.initials: S
authors.lastname: Orita
authors.forename: Masahiko
authors.initials: M
authors.lastname: Suzuki
authors.forename: Ken
authors.initials: K
authors.lastname: Motoori
authors.forename: Yoshitada
authors.initials: Y
authors.lastname: Masuda
authors.forename: Kazuhisa
authors.initials: K
authors.lastname: Takahashi
authors.forename: Shunji
authors.initials: S
authors.lastname: Kishida
mesh_terms: D000077:Acetabulum / Q000473:pathology*; D000293:Adolescent; D000328:Adult; D000368:Aged; D002358:Cartilage, Articular / Q000473:pathology*; D003430:Cross-Sectional Studies; D005260:Female; D006621:Hip Joint / Q000473:pathology*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000473:pathology*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D055815:Young Adult
keywords: Acetabular labral lesions; Osteoarthritis of the hip; Prognostic factor; Radial magnetic resonance imaging