title: Acetabulum-head index in children with normal hips: a radiographic study of 154 hips.
abstract: The acetabulum-head index (AHI), which is used to assess femoral head coverage on plain radiographs, was measured in 77 children (154 hips) with normal hips aged 2 to 14 years. The mean AHI value was 94 (range, 79-114). Both the intraobserver and the interobserver reproducibility of the measurements was high. The AHI values tended to decrease with increasing age. The mean AHI minus 2 standard deviations, which was used to define the border value for subluxation of the femoral head, was 80. The authors propose that an AHI < or = 80 can be used as a guideline to reveal abnormal lateral displacement of the femoral head in children.
authors.affiliation: Department of Orthopaedics, Hudiksvalls Hospital, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Moberg
authors.forename: G
authors.initials: G
authors.lastname: Hansson
authors.forename: C
authors.initials: C
authors.lastname: Kaniklides
mesh_terms: D000077:Acetabulum / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D000293:Adolescent; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D005260:Female; D005270:Femur Head / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D006621:Hip Joint / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D015588:Observer Variation; D011859:Radiography; D012016:Reference Values; D015203:Reproducibility of Results; D013548:Sweden