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A cadaver study validating CT assessment of acetabular component orientation: the Perth CT hip protocol
Varun Arora1, Richard Hannan2, Richard Beaver3
1Department of Orthopaedics, Royal Hobart Hospital, Tasmania, 7000, Australia. Varora1986@gmail.com.
Skeletal Radiology
|November 10, 2016
Summary
This study developed a CT protocol for measuring acetabular cup inclination and anteversion. The CT-based method proved accurate and reliable, regardless of bony landmarks used.
Area of Science:
- Orthopedic surgery
- Radiology
- Medical imaging analysis
Background:
- Accurate measurement of acetabular cup orientation is crucial for successful hip arthroplasty.
- Existing methods for assessing post-operative cup alignment can be variable.
Purpose of the Study:
- To develop and validate a computed tomography (CT)-based protocol for measuring post-operative acetabular cup inclination and anteversion.
- To identify the most accurate bony reference points for these measurements.
Main Methods:
- A virtual 3D model of a cadaveric pelvis with an implanted acetabular liner was created from CT scans.
- Ten radiographers measured cup inclination and anteversion using various bony landmarks on reformatted CT images.
- Intra- and inter-observer variability was assessed against a definitive virtual orientation.
Main Results:
- The CT-based measurements showed high accuracy, with mean inclination of 43.1° and anteversion of 20.8° compared to virtual values of 41.0° and 22.5°.
- No statistically significant differences were found in measurements based on different bony landmarks or between observers.
- The method demonstrated high reliability and reproducibility.
Conclusions:
- CT-based assessment of acetabular component inclination and anteversion is accurate, reliable, and reproducible.
- The inferior acetabular wall/teardrop and posterior ischium are recommended as reference points for measuring inclination and anteversion, respectively.
