Analysis of cover of the femoral head in normal and dysplastic hips: new CT-based technique

J Bone Joint Surg Br. 2008 Nov;90(11):1428-34. doi: 10.1302/0301-620X.90B11.20073.


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.

MeSH terms

  • Acetabulum / diagnostic imaging*
  • Acetabulum / physiopathology
  • Adolescent
  • Adult
  • Female
  • Femur Head / diagnostic imaging*
  • Femur Head / physiopathology
  • Hip Dislocation / diagnostic imaging*
  • Hip Dislocation / physiopathology
  • Humans
  • Joint Deformities, Acquired / diagnostic imaging*
  • Joint Deformities, Acquired / physiopathology
  • Male
  • Middle Aged
  • Range of Motion, Articular / physiology
  • Reference Values
  • Tomography, X-Ray Computed / methods*
  • Tomography, X-Ray Computed / standards
  • Weight-Bearing / physiology