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Pelvic positioning creates error in CT acetabular measurements.

Harold J P van Bosse1, Duron Lee, Eric R Henderson

  • 1Department of Orthopaedic Surgery, Shriners Hospital for Children, 3551 North Broad Street, Philadelphia, PA 19140, USA. hvanbosse@shrinenet.org

Clinical Orthopaedics and Related Research
|March 3, 2011
PubMed
Summary

Pelvic obliquity and tilt significantly impact acetabular measurements, while rotation does not. Understanding these effects is crucial for accurate CT-based assessments of acetabular anteversion and related variables.

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Area of Science:

  • Orthopedic imaging
  • Radiology
  • Anatomy

Background:

  • Computed tomography (CT) enables precise measurement of acetabular orientation and shape.
  • Pelvic malpositioning during CT scans can introduce significant measurement variability.

Purpose of the Study:

  • To compare acetabular anteversion (AA) measurements using femoral head centers versus posterior ischia.
  • To quantify the impact of pelvic obliquity, rotation, and tilt on acetabular variable measurements during CT.

Main Methods:

  • A human pelvis model was subjected to controlled variations in obliquity, rotation, and tilt (up to 20°).
  • CT scans were acquired under these varied conditions.
  • Acetabular anteversion (AA), anterior acetabular sector angle (AASA), posterior acetabular sector angle (PASA), and horizontal acetabular sector angle (HASA) were measured.

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Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
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Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

Main Results:

  • Measurements using femoral head centers and posterior ischia showed a strong correlation (r=0.981) but differed by 1°-4°.
  • Pelvic obliquity and tilt demonstrated a linear association with acetabular measurements.
  • Each 1° increase in obliquity altered AA by -0.4°, while tilt altered AA by 0.8°. Other sector angles showed proportional changes.
  • Pelvic rotation did not affect any measured acetabular variables.

Conclusions:

  • Minor changes in pelvic obliquity and tilt introduce proportional and additive variances in acetabular measurements.
  • Pelvic rotation does not influence the accuracy of these acetabular measurements.
  • Standardized pelvic positioning is essential for reliable CT-based acetabular assessments.