目的 对比CT与MRI在诊断膝关节 半月板损伤中的应用。方法 回顾性分析 高度疑似膝关节半月板损伤患者41例临床 资料，均行CT和MRI诊断，对比诊断结果 及影像学表现，并与关节镜检查对照。结 果 以关节镜检查为“金标准”，MRI诊断 半月板损伤的准确率、敏感性、特异性分 别为97.56%、97.01%、100%，显著高于CT 的79.27%、82.09%、66.67%(P<0.05)。CT 表现为半月板形态改变，明显增大，边缘 粗糙；半月板内有低密度影；撕裂半月板 出现移位；部分存在关节腔积液和多发性 泡状充气征。Ⅰ级损伤MRI的T2WI上可见 半月板内有高信号影，Ⅱ级损伤在T2WI上 可见水平、垂直高信号影，Ⅲ级在T2WI上 为高信号影，且延续至关节面边缘。结论 MRI诊断临床诊断膝关节半月板损伤的准 确率高于CT，且能显示半月板的部位、形 态改变。

Objective To compare the application of CT and MRI in the diagnosis of jmeniscus injury of knee jointoint meniscus injury. Methods The clinical data of 41 cases of patients with suspected meniscus injury of knee joint were analyzed retrospectively. Both of CT and MRI diagnosis were performed. The diagnostic results and imaging findings were compared and were with arthroscopy. Results Arthroscopy was taken as the golden standard and the accuracy, sensitivity and specificity of MRI in diagnosis of meniscus injury were 97.56%, 97.01% and 100%, respectively which were significantly higher than those of CT (79.27%, 82.09%, 66.67%). CT showed that the shape of meniscus changed, and was obviously enlarged and the edge was rough. There was low density shadow in meniscus; Tear meniscus shifted. There were liquid aggregation of joint cavity and multiple bubble inflation signs in some parts. On T2, MRI of grade I injury showed high signal shadow in the meniscus. Grade Ⅱinjury showed horizontal and vertical high signal shadow on T2. Grade Ⅲ showed high signal shadow on T2 and extends to the edge of the articular surface. Conclusion The accuracy rate of MRI in the diagnosis of meniscus injury of knee joint is higher than that of CT, and it can show the location and changes of shape of the meniscus