Visual MRI Grading System to Evaluate Atrophy of the Supraspinatus Muscle
Korean Journal of Radiology
; : 501-507, 2014.
Article
in En
| WPRIM
| ID: wpr-9199
Responsible library:
WPRO
ABSTRACT
OBJECTIVE: To investigate the interobserver reproducibility and diagnostic feasibility of a visual grading system for assessing atrophy of the supraspinatus muscle on magnetic resonance imaging (MRI). MATERIALS AND METHODS: Three independent radiologists retrospectively evaluated the occupying ratio of the supraspinatus muscle in the supraspinatus fossa on 192 shoulder MRI examinations in 188 patients using a 3-point visual grading system (1, > or = 60%; 2, 30-59%; 3, < 30%) on oblique sagittal T1-weighted images. The inter-reader agreement and the agreement with the reference standard (3-point grades according to absolute occupying ratio values quantitatively measured by directly contouring the muscles on MRI) were analyzed using weighted kappa. The visual grading was applied by a single reader to a group of 100 consecutive patients who had undergone rotator cuff repair to retrospectively determine the association between the visual grades at preoperative state and postsurgical occurrences of retear. RESULTS: The inter-reader weighted kappa value for the visual grading was 0.74 when averaged across three reader pairs (0.70-0.77 for individual reader pairs). The weighted kappa value between the visual grading and the reference standard ranged from 0.75 to 0.83. There was a significant difference in retear rates of the rotator cuff between the 3 visual grades of supraspinatus muscle atrophy on MRI in univariable analysis (p < 0.001), but not in multivariable analysis (p = 0.026). CONCLUSION: The 3-point visual grading system may be a feasible method to assess the severity of supraspinatus muscle atrophy on MRI and assist in the clinical management of patients with rotator cuff tear.
Key words
Full text:
1
Index:
WPRIM
Main subject:
Reference Standards
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Magnetic Resonance Imaging
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Muscular Atrophy
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Observer Variation
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Feasibility Studies
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Reproducibility of Results
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Retrospective Studies
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Rotator Cuff
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Joint Diseases
Type of study:
Observational_studies
Limits:
Adult
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Aged
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Female
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Humans
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Male
Language:
En
Journal:
Korean Journal of Radiology
Year:
2014
Type:
Article