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The "true" acetabular anteversion angle (AV angle): 2D CT versus 3D model.

Kira A Barlow1, Zdzislaw Krol2, Pawel Skadlubowicz3

  • 1Pediatric Orthopedic Department, University Children's Hospital Basel (UKBB), Spitalstrasse 33, CH-4056, Basel, Switzerland. k.oesterwind@yahoo.de.

International Journal of Computer Assisted Radiology and Surgery
|July 27, 2022
PubMed
Summary
This summary is machine-generated.

A new 3D method accurately measures acetabular anteversion (AV angle), overcoming inconsistencies found in 2D CT scans. This 3D approach is unaffected by patient positioning and pelvic tilt, offering improved surgical planning.

Keywords:
3D-CTAcetabular anatomyAcetabular anteversionPediatric orthopaedicsPelvic osteotomyPreoperative planningRadiology

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Area of Science:

  • Orthopedics
  • Radiology
  • Medical Imaging

Background:

  • 2D axial CT-cuts present measurement inconsistencies for acetabular version.
  • A need exists for a more reliable method to determine the true acetabular anteversion (AV angle).

Purpose of the Study:

  • To define and validate a "true" acetabular anteversion (AV) angle using a 3D model in a large European population.
  • To compare the accuracy of a novel 3D method against traditional 2D CT measurements.

Main Methods:

  • Analysis of 258 hemipelvises with creation of 3D models.
  • Comparison of AV angle measurements between the 3D method and 2D cross-sectional CT cuts.
  • Inclusion of patient factors such as sex, BMI, and positioning in the analysis.

Main Results:

  • The mean AV angle was 16.1° (3D) versus 22.0° (2D) (p < 0.0001).
  • Significantly larger AV angles were observed in females compared to males with both methods (p < 0.0001).
  • Pelvic tilt influenced AV angle estimation in the 2D method.

Conclusions:

  • A novel 3D method provides accurate acetabular anteversion (AV) measurement, independent of patient positioning and pelvic tilt.
  • The developed computational model aids surgical decision-making and preoperative planning.
  • 3D measurement is proposed as the gold standard for acetabular anteversion assessment.