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

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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.

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Conflict of interest

The authors declare that they have no conflicts of interest.

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Authors and Affiliations

  1. Boca Radiology Group, 951 NW 13th St, Suite 1C, Boca Raton, FL, 33486, USA

    Steven D. Needell & Ross M. Borzykowski

  2. Broward Health Orthopedics and Sports Medicine, 1600 S. Andrews Ave, Fort Lauderdale, FL, 33316, USA

    Dominic S. Carreira & John Kozy

Authors
  1. Steven D. Needell
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  2. Ross M. Borzykowski
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  3. Dominic S. Carreira
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  4. John Kozy
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Correspondence to Steven D. Needell.

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Needell, S.D., Borzykowski, R.M., Carreira, D.S. et al. CT false-profile view of the hip: a reproducible method of measuring anterior acetabular coverage using volume CT data. Skeletal Radiol 43, 1605–1611 (2014). https://doi.org/10.1007/s00256-014-1949-8

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  • DOI: https://doi.org/10.1007/s00256-014-1949-8

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