title: Analysis of cover of the femoral head in normal and dysplastic hips: new CT-based technique.
abstract: We present a new CT-based method which measures cover of the femoral head in both normal and dysplastic hips and allows assessment of acetabular inclination and anteversion. A clear topographical image of the head with its covered area is generated. We studied 36 normal and 39 dysplastic hips. In the normal hips the mean cover was 73% (66% to 81%), whereas in the dysplastic group it was 51% (38% to 64%). The significant advantage of this technique is that it allows the measurements to be standardised with reference to a specific anatomical plane. When this is applied to assessing cover in surgery for dysplasia of the hip it gives a clearer understanding of where the corrected hip stands in relation to normal and allows accurate assessment of inclination and anteversion.
authors.affiliation: Charing Cross Hospital, Fulham Palace Road, London W6 8RF, UK. w.dandachli@imperial.ac.uk
authors.forename: W
authors.initials: W
authors.lastname: Dandachli
authors.forename: V
authors.initials: V
authors.lastname: Kannan
authors.forename: R
authors.initials: R
authors.lastname: Richards
authors.forename: Z
authors.initials: Z
authors.lastname: Shah
authors.forename: M
authors.initials: M
authors.lastname: Hall-Craggs
authors.forename: J
authors.initials: J
authors.lastname: Witt
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging* / Q000503:physiopathology; D000293:Adolescent; D000328:Adult; D005260:Female; D005270:Femur Head / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006617:Hip Dislocation / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006801:Humans; D016916:Joint Deformities, Acquired / Q000000981:diagnostic imaging* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D016059:Range of Motion, Articular / Q000502:physiology; D012016:Reference Values; D014057:Tomography, X-Ray Computed / Q000379:methods* / Q000592:standards; D016474:Weight-Bearing / Q000502:physiology