title: Coverage of the femoral head by the acetabular labrum in dysplastic hips: quantitative analysis with radial MR imaging.
abstract: Hip dysplasia is an important cause of osteoarthrosis of the hip, especially in Japanese. Recently, the role of the acetabular labrum in hip diseases has attracted the attention of researchers, but the condition of the labrum in the dysplastic hips has not been described. We used radial MRI to measure the degree of coverage of the femoral head by the acetabulum and the labrum, corresponding to 7 positions on the acetabular rim at every 15 degrees from anterosuperior 45 degrees via midsuperior to posterosuperior 45 degrees. 38 Japanese patients (51 hips) with dysplasia, and 11 healthy controls 122 hips) were studied. In the dysplastic hips, the labrum was larger than in the controls. We found no correlation between the coverage of the acetabulum in the anterosuperior positions and the size of the labrum among the dysplastic hips.
authors.affiliation: Department of Orthopaedic Surgery, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, Japan. horii@koto.kpu-m.ac.jp
authors.forename: Motoyuki
authors.initials: M
authors.lastname: Horii
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Kubo
authors.forename: Shigehiro
authors.initials: S
authors.lastname: Inoue
authors.forename: Wook-Choel
authors.initials: WC
authors.lastname: Kim
mesh_terms: D000077:Acetabulum / Q000473:pathology*; D000293:Adolescent; D000328:Adult; D000886:Anthropometry / Q000379:methods; D001696:Biomechanical Phenomena; D016022:Case-Control Studies; D018450:Disease Progression; D005260:Female; D005270:Femur Head / Q000473:pathology*; D006617:Hip Dislocation / Q000150:complications / Q000473:pathology* / Q000503:physiopathology; D006801:Humans; D007564:Japan; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000209:etiology; D016059:Range of Motion, Articular; D012720:Severity of Illness Index; D018709:Statistics, Nonparametric