目的 探讨MRI对膝关节半月板损伤的诊断及分级对指导临床关节镜手术的价值。方法 收集自2013年9月-2014年9月 期间，使用GE 1.5T Hde MRI行膝关节检查并行关节镜手术的患者共83例，共计166个半月板，以关节镜检查结果为 金标准，对MRI检查诊断膝关节半月板损伤的结果进行对比分析。结果 关节镜检查发现60个正常半月板，38个未 破裂半月板，68个半月板撕裂；MRI诊断0级65个，Ⅰ级11个，Ⅱ级14个，Ⅲ级56个，Ⅳ级20个。其中假阳性4.8% （8/166），假阴性7.8%（13/166）；MRI检查对半月板损伤总的灵敏度、特异度、准确性、阳性预测值及阴性预测 值分别为87.7%、86.7%、87.3%、92.1%、80%。MRI与关节镜两种检查方法对比差异无明显统计学意义(X2 =0.76,p＞ 0.25)。结论 MRI能够比较准确的对膝关节韧带损伤进行诊断,可做为关节镜手术前有效的筛查方法，为临床治疗提 供可靠的诊断依据，指导临床手术方案的制定。

Objective Purpose to determine the ability of MRI to diagnosis and classification of knee meniscus injury,in order to indicate the surgical procedures. Methods A total of 83 patients were prospectively studied by GE 1.5T MRI and arthroscopy in our hospital, from September 2013 to September 2014.Diagnostic accuracy of MRI for the detection injury of the meniscus was calculated using arthroscopy as the standard of reference. Results Arthroscopy found 60 normal meniscus, 38 unruptured meniscus, 68 meniscus tear;MRI diagnostic grade 0 in 65, grade Ⅰin 11, grade Ⅱ in 14, grade 0 in 56, grade Ⅳ in 20. False positive 4.8% (8/166), false negative7.8% (13/166); Sensitivity, specificity, accuracy,PPV,NPV of MRI for meniscus injury were 87.7%, 86.7%, 87.3%, 92.1%, 80%.There was no statistically significant difference(X2 =0.76,p>0.05). Conclusion MRI represents a highly accurate method for identifying injury of the meniscus,it is a effective screening method before arthroscopic surgery.