Interobserver variability in interpreting radiographic lucencies about total hip reconstructions

Area of Science:

• Orthopedic surgery
• Medical imaging
• Radiology

Background:

• Radiographs are essential for evaluating total hip reconstruction (THR) outcomes.
• Assessing THR loosening, planning revisions, and long-term follow-up rely on radiographic interpretation.
• Interobserver variability in radiographic assessment can affect patient management and research accuracy.

Purpose of the Study:

• To quantify interobserver variability in the radiographic assessment of total hip reconstruction (THR).
• To evaluate the reliability of interpreting acetabular and femoral components in post-THR radiographs.
• To identify specific areas of disagreement in lucency assessment for improved diagnostic accuracy.

Main Methods:

• Analysis of 63 follow-up radiographs from 93 patients 8-12 years post-total hip reconstruction (THR).
• Nine specific observations were made on both acetabular and femoral components, totaling 567 observations.
• Three observers independently interpreted the radiographs to assess interobserver agreement on lucency presence and size.

Main Results:

• Considerable disagreement was found in assessing acetabular lucencies, with consensus achieved only 46% of the time.
• Higher agreement (87%) was observed for femoral side analysis, particularly when no lucency was present.
• Observer variability did not differ based on the magnitude of lucency reported.

Conclusions:

• Single observers can reliably assess femoral lucencies, distinguishing presence or absence.
• Acetabular lucency assessment by a single observer shows lower reliability, especially for lucencies >2 mm.
• Standardized interpretation protocols may be needed to improve consistency in acetabular component evaluation.