No cálculo amostral assumiu-se precisão da estimativa de15%, com erro amostral de 5% e com poder de amostragem de 80%. Observar secundariamente se existe influênciada experiência profissional sobre a concordância entre observadores para a classificaçãodessa patologia.Métodos: Foram usadas 83 imagens digitalizadas de radiografias pré-operatórias, em inci-dências anteroposterior e perfil, de fraturas do tornozelo de adultos diferentes, ocorridasentre janeiro e dezembro de 2013. Objetivo: Avaliar a reprodutibilidade e comparatividade das três principais classificaçõesusadas para fraturas do tornozelo mais comumente empregadas nos servicos de emergên-cia: Lauge-Hansen, Danis-Weber e AO-OTA. The AO classification demonstrated a moderate agreement and the Danis-Weber classification presented an excellent interobserver agreement index, regardless of professional experience Conclusion: The Hansen-Lauge classification presented the poorest interobserver agreement among the three systems. The Kappa index was 0.49 for the Danis-Weber classification, 0.32 for Lauge Hansen, and 0.38 for AO. Results: The Danis-Weber classification indicated that 40% of the agreements among all observers were good or excellent, whereas only 20% of good and excellent agreements were obtained using the AO and Lauge Hansen classifications. The Kappa statistical method of multiple variances was used to assess the variations. The images were analyzed and classified by six different observers: two foot and ankle surgeons, two general orthopedic surgeons, and two-second-year residents in orthopedics and traumatology. For sample calculation, the estimated accuracy was approximately 15%, with a sampling error of 5% and a sampling power of 80%. Methods: The study included 83 digitized preoperative radiographic images of ankle fractures, in anteroposterior and lateral views, of different adults that had occurred between January and December 2013. The secondary objective was to assess whether the level of professional experience influenced the interobserver agreement for the classification of this pathology. Objective: This study evaluated the reproducibility of the three main classifications of ankle fractures most commonly used in emergency clinical practice: Lauge-Hansen, Danis-Weber, and AO-OTA.
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