Value of Axial 3-D Fourier Transformation GRASS MR Images in Diagnosis of Meniscal Tears of the Knee.
10.3348/jkrs.1996.34.2.263
- Author:
Young Jun AHN
1
;
Soon Tae KWON
;
Youn Sin JEONG
;
Chang Lak CHOI
;
Wan Gyu YOUN
;
June Sik CHO
;
Kwang Jin LEE
Author Information
1. Department of Diagnostic Radiology, Chungnam National University College of Medicine, Korea.
- Publication Type:Original Article
- Keywords:
Knee, injuries;
Knee, MR;
Knee, ligaments, menisci, and cantilage
- MeSH:
Arthroscopy;
Diagnosis*;
Fourier Analysis*;
Humans;
Imaging, Three-Dimensional;
Knee*;
Poaceae*;
Sensitivity and Specificity
- From:Journal of the Korean Radiological Society
1996;34(2):263-268
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: The purpose of this study is to compare the sensitivity and specificity of axial 3-D imaging with those of conventional 2-D imaging in the diagnosis of meniscal injuries. MATERIALS AND METHODS: Twenty-nine kneesof 27 patients with clinically suspected meniscal tears were imaged at a 1.5 T MR system. Conventional 2-D imagesand axial 3-D GRASS images were obtained in all cases. Arthroscopic or surgical confirmation was available in allcases and was used as the gold standard. RESULTS: Among the 29 knee-joints evaluated, 21 of 23 meniscal tears and 33 of 35 normal menisci were correctly identified with axial 3-D imaging, yielding a sensitivity of 91.3% and specificity of 94.3%. Conversely, the sensitivity was 82.6% and the specificity was 97.1% for the conventional 2-Dtechnique. A combination of both techniques yielded 95.7% sensitivity and 100% specificity in the diagnosis of meniscal tears. Of the 23 meniscal tears proven at arthroscopy or surgery, there were four discrepancies between the two techniques ; three of the four represented false-negative 2-D images and one was a false-negative axial3-D image. Of 35 normal menisci, two false-positives occurred with axial 3-D imaging and one with 2-D imaging. CONCLUSION: Despite the lack of a statistically significant difference between the efficacy of the two techniques, these results suggest that the sensitivity in the diagnosis of meniscal tears can be improved by adding thin-sliced axial 3-D GRASS imaging to conventional 2-D imaging in the limited cases with clinically suspected meniscal tears.
