Diagnostic accuracy of preoperative magnetic resonance imaging for detecting subscapularis tendon tears: a diagnostic test study

Autor(es)

Lucas Busnardo Ramadan ; Eduardo Baptista ; Felipe Ferreira de Souza ; Mauro Emilio Conforto Gracitelli ; Jorge Henrique Assunção ; Fernando Brandao Andrade-Silva ; Arnaldo Amado Ferreira-Neto ; Eduardo Angeli Malavolta

• Tipo de documento: Artigo Científico
• Fonte: São Paulo Medical Journal; n. ahead, p. -, 2020.

Resumo

ABSTRACT BACKGROUND: The accuracy of magnetic resonance imaging (MRI) for making the diagnosis of subscapularis tears presents wide variation in the literature and there are few prospective studies. OBJECTIVE: To compare the findings from MRI and arthroscopy for diagnosing subscapularis tears. DESIGN AND SETTING: Diagnostic test study performed in a tertiary care hospital. METHODS: We included patients who underwent arthroscopic rotator cuff repair and who had firstly undergone high magnetic field MRI without contrast. The images were independently evaluated by a shoulder surgeon and two musculoskeletal radiologists. Sensitivity, specificity, positive and negative predictive values, accuracy and inter and intra-observer agreement were calculated. RESULTS: MRIs on 200 shoulders were evaluated. The incidence of subscapularis tears was 69.5% (41.5% partial and 28.0% full-thickness). The inter and intra-observer agreement was moderate for detection of subscapularis tears. The shoulder surgeon presented sensitivity of 51.1% to 59.0% and specificity of 91.7% to 94.4%. The radiologists showed sensitivity of 83.5% to 87.1% and specificity of 41% to 45.9%. Accuracy ranged from 60.5% to 73.0%. CONCLUSION: The 1.5-T MRIs without contrast showed mean sensitivity of 70.2% and mean specificity of 61.9% for detection of subscapularis tears. Sensitivity was higher for the musculoskeletal radiologists, while specificity was higher for the shoulder surgeon. The mean accuracy was 67.6%, i.e. lower than that of rotator cuff tears overall. (AU)

• Processo FAPESP: 17/02896-2 - Acurácia da ressonância magnética pré-operatória no diagnóstico das roturas do tendão do subescapular: estudo prospectivo
• Beneficiário: Eduardo Angeli Malavolta
• Modalidade de apoio: Auxílio à Pesquisa - Regular