Inter- and intra-observer variability of the AO/OTA classification for sternal fractures: a validation study

Area of Science:

• Orthopedic Trauma Surgery
• Radiology
• Medical Classification Systems

Background:

• A new AO/OTA sternal fracture classification system was recently introduced.
• Evaluating the reliability of this new classification is crucial for clinical application.

Purpose of the Study:

• To assess the inter- and intra-observer variability of the AO/OTA sternal fracture classification.
• To identify potential areas for improvement in the classification system.

Main Methods:

• A diagnostic cross-sectional study (Level I evidence) was conducted.
• Twenty multidetector CT scans of sternal fractures were reviewed by 12 orthopedic trauma surgeons (6 senior, 6 junior).
• Surgeons assessed the scans twice, 6 weeks apart, with kappa values calculated for agreement.

Main Results:

• Inter-observer agreement for the AO/OTA classification was fair-to-moderate (kappa = 0.364).
• No significant difference in agreement was found between junior and senior surgeons.
• Lowest agreement was observed for classifying sternal body fractures (kappa = 0.319).
• Intra-observer agreement showed moderate reliability (mean kappa = 0.414).

Conclusions:

• The AO/OTA sternal fracture classification demonstrates fair-to-moderate inter- and intra-observer agreement.
• Minor modifications to the classification system could potentially improve its performance.