四肢MR对半月板撕裂的价值

Dedicated extremity MR: evaluation of knee meniscal tears

目的探讨低场强四肢专用MR对膝关节半月板撕裂的诊断价值。方法回顾分析 5 6例 78个膝关节的低场强四肢专用MR资料 ,这些病例均经手术或 /和关节镜证实。结果在MR图像上 ,78个膝关节的 15 6个半月板中 ,98个 (6 2 .8% )呈Ⅲ度信号异常 ,14个 (8.9% )半月板结构破碎 ,15个 (9.6 % )呈Ⅰ度和Ⅱ度信号异常 ,4 4个 (2 8.2 % )正常。以关节镜或 /和手术为金标准 ,四肢专用MR诊断半月板撕裂的敏感性为 10 0 % ,特异性为 92 % ,准确性为 97%。

Objective to evaluate the diagnostic value of dedicated extremity MR system for meniscal tears. Methods 78 knee joints of 56 patients confirmed by subsequent arthroscopy or surgery were examined with 0.2T dedicated extremity MR system. All MR images were retrospectively analyzed for meniscal lesions. Results 98 menisci out of 167 observed menisci (62.8%) revealed linear or irregular regions of intermediate signal intensity that extended to the articular surface (grade 3). 14 menisci (8 9%) with fragmentations. 15 menisci (9.6%) contained one or more circular foci or linear regions of intermediate signal intensity that did not extent to an articular surface (grade 1 or 2). If the results of arthroscopy or/and surgery were considered the golden rule, the diagnostic sensitivity, specificity, and accuracy of dedicated MR system for meniscal tears were 100%, 92%, and 97%, respectively. Conclusion dedicated extremity MR system has high diagnostic power for meniscal tears of knee joints.