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Objective: to evaluate the critical shoulder angle by comparing the results of measurements performed by radiography and magnetic resonance imaging, considering the intra and interobserver perspectives.
Methods: we evaluated radiographic and magnetic resonance images of 74 shoulders (71 patients) submitted to these exams between 2017 and 2020, regardless of the acquired pathology. We ran a statistical analysis comparing the mean values of the data obtained by the student's t-test, and the analysis of intra and interobserver agreement used the Interclass Correlation Coefficient (ICC), with bidirectional mixed models and a confidence interval of 95%.
Results: the patients had a mean age of 51.7 years, with a predominance of men (51.9%) and the most affected shoulder was the right-sided one (57.9%). There were no significant differences between the measurements made by radiography and those by magnetic resonance, both by intra and interobserver views, and the ICC showed a satisfactory level of agreement in relation to these aspects. Conclusion: there was an excellent degree of agreement between the examiners, in all the situations compared (intra and interobserver, radiography and MRI), considering the two periods of analysis.
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