Skeletal Radiology

, Volume 43, Issue 11, pp 1605–1611 | Cite as

CT false-profile view of the hip: a reproducible method of measuring anterior acetabular coverage using volume CT data

  • Steven D. Needell
  • Ross M. Borzykowski
  • Dominic S. Carreira
  • John Kozy
Technical Report

Abstract

Objective

To devise a simple, reproducible method of using CT data to measure anterior acetabular coverage that results in values analogous to metrics derived from false-profile radiographs.

Materials and methods

Volume CT images were used to generate simulated false-profile radiographs and cross-sectional false-profile views by angling a multiplanar reformat 115° through the affected acetabulum relative to a line tangential to the posterior margin of the ischial tuberosities. The anterolateral margin of the acetabulum was localized on the CT false-profile view corresponding with the cranial opening of the acetabular roof. Anterior center edge angle (CEA) was measured between a vertical line passing through the center of the femoral head and a line connecting the center of the femoral head with the anterior edge of the condensed line of the acetabulum (sourcil). Anterior CEA values measured on CT false-profile views of 38 symptomatic hips were compared with values obtained on simulated and projection false-profile radiographs.

Results

The CT false-profile view produces a cross-sectional image in the same obliquity as false-profile radiographs. Anterior CEA measured on CT false-profile views were statistically similar to values obtained with false-profile radiographs. CT technologists quickly mastered the technique of generating this view. Inter-rater reliability indicated this method to be highly reproducible.

Conclusions

The CT false-profile view is simple to generate and anterior CEA measurements derived from it are similar to those obtained using well-positioned false-profile radiographs. Utilization of CT to assess hip geometry enables precise control of pelvic inclination, eliminates projectional errors, and minimizes limitations of image quality inherent to radiography.

Keywords

Acetabulum Anterior Coverage Dysplasia Hip Sourcil 

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Copyright information

© ISS 2014

Authors and Affiliations

  • Steven D. Needell
    • 1
  • Ross M. Borzykowski
    • 1
  • Dominic S. Carreira
    • 2
  • John Kozy
    • 2
  1. 1.Boca Radiology GroupBoca RatonUSA
  2. 2.Broward Health Orthopedics and Sports MedicineFort LauderdaleUSA

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