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Validation of a new 2.5D radiographic index evaluating acetabular coverage using ACX software
Shoichi Nishikino1, Hiroshi Koyama1, Hiroki Furuhashi1
1Department of Orthopaedic Surgery, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan.
Summary
The radial centre-edge angle (RCEA) calculated by ACX Dynamics software accurately quantifies acetabular coverage from AP pelvic radiographs. This method offers reliable and reproducible measurements for assessing hip joint health.
Area of Science:
- Radiology
- Orthopedics
- Medical Imaging Analysis
Background:
- Traditional radiographic assessments of acetabular coverage are limited by 2D limitations.
- Accurate measurement of acetabular coverage is crucial for diagnosing hip conditions.
Purpose of the Study:
- To validate the accuracy of the radial centre-edge angle (RCEA) calculated by ACX Dynamics software.
- To assess RCEA as a quantitative parameter for acetabular coverage using AP pelvic radiographs.
Main Methods:
- Compared RCEA from ACX Dynamics software with CT measurements in 50 hip radiographs.
- Determined the absolute RCEA difference, correlation, and intra-observer/inter-observer reliability.
Main Results:
- High correlation (>0.7) between ACX Dynamics RCEA and CT RCEA (p < 0.001).
- Excellent intra-observer reliability (0.83-0.97) and good inter-observer reliability (>0.80).
- Small absolute RCEA differences (1.9-3.1°) across various angles.
Conclusions:
- ACX Dynamics software provides a simple, quantitative method for assessing acetabular coverage.
- RCEA derived from AP pelvic radiographs is a reliable parameter for clinical use.
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