Reproducibility of the Tronzo and AO classifications for transtrochanteric fractures☆

OBJECTIVE To analyze the reproducibility of the Tronzo and AO classifications for transtrochanteric fractures. METHOD This was a cross-sectional study in which the intraobserver and interobserver concordance between two readings made by 11 observers was analyzed. The analysis of the variations used the kappa statistical method. RESULTS Moderate concordance was found in relation to the AO classification, while slight concordance was found for the Tronzo classification. CONCLUSION This study found that the AO/Asif classification for transtrochanteric presented greater intra and interobserver reproducibility and that greater concordance was correlated with greater experience of the observers. Without division into subgroups, the AO/Asif classification was shown, as described in the literature, to be acceptable for clinical use in relation to transtrochanteric fractures of the femur, although it did not show absolute concordance, given that its concordance level was only moderate. Nonetheless, its concordance was better than that of the Tronzo classification.