The Use of a Horizontal Reference Line While Measuring the Anterior Center Edge Angle Is More Reliable Than the...

Area of Science:

• Radiology
• Orthopedic Surgery
• Medical Imaging Analysis

Background:

• The anterior center edge angle (ACEA) is crucial for evaluating anterior acetabular coverage in hip abnormalities.
• Traditional ACEA measurements are highly sensitive to patient positioning and imaging techniques, impacting reliability.

Purpose of the Study:

• To assess a novel measurement technique using a horizontal reference line and femoral head circles for improved ACEA determination.
• To evaluate the reproducibility of this new method in controlling pelvic obliquity and measuring ACEA.

Main Methods:

• Retrospective review of false-profile radiographs from 21 patients by three authors.
• Comparison of traditional ACEA measurements with a novel method involving a horizontal reference line and best-fit femoral head circles.
• Statistical analysis using paired t-tests and intraclass correlation coefficients (ICC) for interrater and intrarater reliability.

Main Results:

• The novel method demonstrated strong intrarater reliability (ICC = 0.805-0.966) and interrater reliability (ICC = 0.831-0.902).
• The traditional method showed weaker interrater reliability for two of three reviewers (ICC = 0.420, 0.585).
• No significant difference in mean ACEA values between the two methods (P = .36).

Conclusions:

• The novel measurement technique offers superior reproducibility for ACEA assessment compared to the traditional method.
• This standardized approach is recommended for future research in hip dysplasia and femoroacetabular impingement.
• The findings support the adoption of this technique for more consistent radiographic evaluation of hip coverage.