title: Magnetic resonance imaging evaluation of surgical management in developmental dysplasia of the hip in childhood.
abstract: Magnetic resonance imaging (MRI) was performed on 73 hips in 59 children aged 3 to 16 months after surgical reduction of developmental dislocation of the hip. Twenty-seven hips in 22 children had repeat MRI 6 weeks after reduction, and 20 hips in 16 patients had further MRI at least 1 year later. Only 38% of hips appeared concentrically reduced on the initial MRI scan, but this increased to 90% by 1 year later, without intervention. The authors measured coronal plane acetabular index and transverse plane anterior, posterior, and axial acetabular indices, as well as acetabular version and anteversion. Persistent difference could be shown in the coronal plane acetabular index between the dysplastic and normal sides for the cartilaginous anlage and the bony model of the acetabulum in scans performed at least 1 year after reduction. However, 40% of cartilaginous coronal plane acetabular indices fell within the "normal" range at 1 year. No other parameters could be shown to be persistently different.
authors.affiliation: Department of Orthopaedic Surgery, Royal Children's Hospital, Melbourne, Australia.
authors.forename: Catherine M
authors.initials: CM
authors.lastname: Duffy
authors.forename: Fabian Norman
authors.initials: FN
authors.lastname: Taylor
authors.forename: Lee
authors.initials: L
authors.lastname: Coleman
authors.forename: H Kerr
authors.initials: HK
authors.lastname: Graham
authors.forename: Gary R
authors.initials: GR
authors.lastname: Nattrass
mesh_terms: D002675:Child, Preschool; D005260:Female; D005500:Follow-Up Studies; D006618:Hip Dislocation, Congenital / Q000175:diagnosis* / Q000601:surgery*; D006801:Humans; D007223:Infant; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D015588:Observer Variation; D019637:Orthopedic Procedures / Q000379:methods; D010384:Pelvic Bones / Q000000981:diagnostic imaging / Q000473:pathology; D011336:Probability; D011859:Radiography; D016059:Range of Motion, Articular / Q000502:physiology; D020127:Recovery of Function; D012680:Sensitivity and Specificity; D016896:Treatment Outcome