title: Development of the acetabulum and the acetabular labrum in the normal child: analysis with radial-sequence magnetic resonance imaging.
abstract: The degree of acetabular and labral coverage was clarified in children at different positions using radial-sequence magnetic resonance imaging. Scans were performed on 40 hips in 20 normal children (group A, 6-8 years old; group B, 9-11 years old; group C, 12-13 years old) and on 19 hips of 10 healthy adults as controls. The degrees of coverage of the femoral head by acetabulum, acetabular labrum, and both were measured at seven positions at every 15 degrees from anterosuperior 45 degrees via midsuperior to posterosuperior 45 degrees. Coverage of the femoral head by the acetabulum in young children was less than in adults at all positions, but the total coverage including the labrum was greater than in adults. Development of the acetabulum and the acetabular labrum showed differences by position.
authors.affiliation: Department of Orthopaedic Surgery, Kyoto Prefectural University of Medicine, Kyoto, 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: Yudo
authors.initials: Y
authors.lastname: Hachiya
authors.forename: Tsunehiko
authors.initials: T
authors.lastname: Nishimura
authors.forename: Yasusuke
authors.initials: Y
authors.lastname: Hirasawa
mesh_terms: D000077:Acetabulum / Q000254:growth & development*; D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D005270:Femur Head; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male