半月板可疑撕裂的MRI与关节镜对照研究

MRI of Equivocal Tears of Menisci:Correlation with Arthroscopy

目的：研究半月板可疑撕裂的出现机率及其临床意义。材料和方法：回顾性分析了１２６个膝关节的ＭＲ扫描资料，当二位放射科医生均不能肯定半月板内的高信号是否延伸至半月板表面时，诊断为半月板可疑撕裂，并与关节镜检查结果进行对照。结果：１２６例中有２２例诊断为半月板可疑撕裂，占１７．５％。１２例位于内侧半月板的后角，４例位于外侧半月板的前角，６例位于外侧半月板的后角。２２例中１８例作了关节镜检查，只有２例发现有撕裂．结论：当ＭＲＩ上难以确定半月板内的高信号是否延伸至半月板表面时，发生半月板撕裂的可能性不大。

To investigate the prevalence of equivocal tears of menisci on MR images and to evaluate their clinical significance. Materials and Methods: MR scans of 126 knee joints in 126 patients were evaluated retrospectively, and equivocal tears of the menisci were diagnosed if both radiologists were uncertain whether the high signal in the menisci extended to the meniscal surface. The MR findings were correlated with the results of arthroscopy. Results: Equivocal tears of menisci were diagnosed in 22 cases. Their prevalence was 17. 5%(22/126),12 were in the posterior horn of the medial menisci, 4 in the anterior horn and 6 in the posterior horn of the lateral menisci. In 18 cases with arthroscopy correlation, true tears were found in 2 cases only. Conclusion:A meniscal tear is unlikely if the high sigal in a meniscus on MR images does not unequivocally extend to the surface of the meniscus.