title: [Changes in the cartilaginous contour of Legg-Calvé-Perthes disease: calculation on T1-weighted MR images].
abstract: T1-weighted MR images of Legg-Calvé-Perthes disease (LCPD) were classified into three groups on the basis of radiographic stage, and morphological differentiation for staging was attempted. In the stage of fragmentation, both enlargement and flattening of the cartilaginous contour surrounding the epiphysis could be recognized on MRI, and the growth plate showed more curvature than normal. This produced flattening of the epiphysis in the shape of a crescent. We confirmed these findings using four indexes for the measurement of cartilaginous outline, and the stage of avascular necrosis and fragmentation could be clearly differentiated. Cartilaginous deformities on MRI are very useful for differentiating between the stage of avascular necrosis and fragmentation.
authors.affiliation: Department of Radiology, Kansai Rosai Hospital.
authors.forename: Y
authors.initials: Y
authors.lastname: Kumasaka
authors.forename: H
authors.initials: H
authors.lastname: Watanabe
authors.forename: T
authors.initials: T
authors.lastname: Higashihara
authors.forename: H
authors.initials: H
authors.lastname: Kishimoto
authors.forename: K
authors.initials: K
authors.lastname: Harada
authors.forename: T
authors.initials: T
authors.lastname: Kozuka
mesh_terms: D002358:Cartilage, Articular / Q000473:pathology*; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007873:Legg-Calve-Perthes Disease / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male