Evaluation of patellar cartilage surface lesions: comparison of CT arthrography and fat-suppressed FLASH 3D MR imaging |
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Authors: | B R Daenen M A Ferrara S Marcelis R F Dondelinger |
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Institution: | (1) Department of Medical Imaging, University Hospital Sart-Tilman, B-4000 Liège, Belgium, BE |
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Abstract: | The aim of this study was to evaluate the sensitivity and specificity of fat-suppressed fast low-angle shot (FLASH) 3D MR
imaging in the detection of patellar cartilage surface lesions in comparison with CT arthrography. Fifty patients, with or
without symptoms of chondromalacia, were prospectively examined by CT arthrography and fat-suppressed 3D gradient-echo MR
imaging. All MR examinations were evaluated by three observers, two of them reaching a consensus interpretation. The lesions
were graded according to their morphology and their extent. The CT arthrography was considered as the reference examination.
For both sets of observers, the final diagnosis of chondromalacia was obtained in 92.5 %. The specificity was 60 % on a patient-by-patient
basis. Fissures were missed in 83 and 60 %, respectively, but were isolated findings only in 2.5 % of the cases. Considering
ulcers involving more than 50 % of the cartilage thickness, 65 and 88 %, respectively, were recognized. Fat-suppressed FLASH
3D is an adequate pulse sequence for the detection of patellar cartilage ulcers. It can be applied on a routine clinical basis,
but it does not show as many fissures as CT arthrography and is less precise for grading of lesions.
Received 30 July 1997; Revision received 23 December 1997; Accepted 29 December 1997 |
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Keywords: | : Chondromalacia Cartilage MR imaging CT arthrography |
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