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Objective  To evaluate the feasibility of magnetic resonance imaging (MRI) to obtain the critical shoulder angle (CSA) comparing the results obtained through radiography and MRI, and assess the learning curves. Methods  In total, 15 patients were evaluated in a blinded and randomized way. The CSA was measured and compared among groups and subgroups. Results  The mean angles measured through the radiographic images were of 34.61 ± 0.67 and the mean angles obtained through the MRI scans were of 33.85 ± 0.53 ( p  = 0.29). No significant differences have been found among the groups. The linear regression presented a progressive learning curve among the subgroups, from fellow in shoulder surgery to shoulder specialist and radiologist. Conclusion  There was no statistically significant difference in the X-rays and MRI assessments. The MRI seems to have its efficacy associated with more experienced evaluators. Data dispersion was smaller for the MRI data regardless of the experience of the evaluator.

revista brasileira de ortopedia

Estudo duplo-cego randomizado da correlação entre radiografia simples e ressonância magnética na avaliação do ângulo crítico do ombro: Reprodutibilidade e curva de aprendizado