Radiographic diagnosis of rotator cuff tear based on the supraspinatus muscle radiodensity |
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Authors: | B Stallenberg Jacques Rommens Catherine Legrand Viviane de Maertelaer Thierry Metens Pierre Alain Gevenois |
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Institution: | Department of Radiology, H pital Erasme, Université Libre de Bruxelles, Brussels, Belgium. |
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Abstract: | Objective. To evaluate the supraspinatus muscle radiodensity on the outlet view as an indication of a tendon tear.
Design and patients. Plain radiographs and magnetic resonance imaging (MRI) examinations were obtained on both shoulders of 40 subjects aged
23–70 years, including 13 asymptomatic volunteers and 27 patients. Two readers analyzed the superior contour and the heterogeneity
of the supraspinatus muscle radiodensity and compared them with the MRI findings.
Results and conclusion. Significant concordances (P<0.001) were found between the assessments of the superior contour and the heterogeneity of the muscle radiodensity, respectively,
on plain radiographs and MR images. For the diagnosis of a full-thickness tear, the analysis of the superior contour and the
heterogeneity of the muscle radiodensity reached an accuracy of 85% and 80% respectively. Stepwise discriminant analyses showed
low to moderate benefit of considering the contour and the heterogeneity simultaneously. The inter- and intraobserver agreement
ranged from moderate to good. We conclude that on the outlet view, modifications in the superior contour and heterogeneity
of the supraspinatus muscle radiodensity suggest a full-thickness tear.
Received: 6 December 1999 Revision requested: 6 March 2000 Revision received: 5 June 2000 Accepted: 4 October 2000 |
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Keywords: | Shoulder Injuries tendons Injuries muscles |
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