title: Assessment of lateral subluxation in Legg-Calvé-Perthes disease: a time-sequential study of magnetic resonance imaging and plain radiography.
abstract: Lateral subluxation of the femoral head is one of the poor prognostic factors of Legg-Calvé-Perthes disease. The aim of this study was to investigate the cause of lateral subluxation of the femoral head on the basis of the changes over time on MRI. Twenty-four patients with unilateral Legg-Calvé-Perthes disease were analyzed retrospectively. Lateral subluxation was measured as the tear drop distance on radiographs. We focused on joint fluid, medial articular cartilage thickening, and abnormal lesion on MRI. Lateral subluxation continued significantly in patients with poor results. Among the MRI findings, the presence of an abnormal lesion was associated significantly with the continuous lateral subluxation.
authors.affiliation: aDepartment of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine bDepartment of Orthopaedic Surgery, Kyoto Second Red Cross Hospital, Kyoto, Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kotoura
authors.forename: Wook-Cheol
authors.initials: WC
authors.lastname: Kim
authors.forename: Motoo
authors.initials: M
authors.lastname: Hosokawa
authors.forename: Takashi
authors.initials: T
authors.lastname: Yoshida
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Oka
authors.forename: Naotake
authors.initials: N
authors.lastname: Yamada
authors.forename: Masashi
authors.initials: M
authors.lastname: Nakase
authors.forename: Atsushi
authors.initials: A
authors.lastname: Nishida
authors.forename: Koichi
authors.initials: K
authors.lastname: Yokozeki
authors.forename: Torao
authors.initials: T
authors.lastname: Kusakabe
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Kubo
mesh_terms: D001175:Arthrography / Q000379:methods*; D002648:Child; D002675:Child, Preschool; D005260:Female; D005270:Femur Head / Q000000981:diagnostic imaging / Q000473:pathology; D005500:Follow-Up Studies; D006617:Hip Dislocation / Q000175:diagnosis* / Q000209:etiology; D006801:Humans; D007873:Legg-Calve-Perthes Disease / Q000150:complications / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D012189:Retrospective Studies; D013997:Time Factors