Inter-Rater and Intra-Rater Repeatability and Reliability of EOS 3-Dimensional Imaging Analysis Software

Area of Science:

• Orthopedic Surgery
• Medical Imaging

Background:

• Accurate component positioning in total hip arthroplasty (THA) is crucial for optimal patient outcomes.
• Traditional methods for quantifying component position have limitations.
• The EOS imaging system, a biplanar low-dose X-ray system, enables 3D modeling and semiautomated measurements.

Purpose of the Study:

• To evaluate the reliability and accuracy of the EOS imaging system for measuring pelvic parameters and implant alignment after THA.
• To assess the interobserver and intraobserver agreement for measurements obtained using the EOS system.

Main Methods:

• Retrospective analysis of 25 patients who underwent primary THA.
• Measurements of pelvic parameters and implant alignment were performed by three independent reviewers on three separate occasions.
• Validation using four pelvic phantom models and assessment of interclass correlation (>0.75) for reliability.

Main Results:

• The EOS 3D software demonstrated accuracy in phantom model analysis.
• All measurements showed excellent interobserver and intraobserver agreement, with interclass correlation coefficients greater than 0.75.
• This confirms the reliability of the EOS system for assessing THA component position.

Conclusions:

• Three-dimensional modeling using the EOS imaging system is a viable and reliable method for evaluating component position after total hip arthroplasty.
• The system facilitates accurate assessment of pelvic parameters and implant alignment, contributing to improved surgical planning and outcomes.