膝关节交叉韧带低场强MRI表现及其损伤诊断

目的 :研究膝关节正常交叉韧带MRI特点和交叉韧带损伤的的MRI表现。方法 :对 2 0 0例正常膝关节交叉韧带的MRI进行回顾性分析 ,对 2 5例临床可疑交叉韧带损伤患者的MRI资料和关节镜检查行对比研究。结果 :正常膝关节矢状位MRI上显示交叉韧带最佳 ,冠状位和横断位作为补充 ,交叉韧带损伤的MRI表现为韧带连续性中断、局灶性或弥漫性肿胀、信号强度增高及断端移位 ;以关节镜检查结果为标准 ,MRI诊断交叉韧带损伤的敏感度为 91.3 % ,特异度为 91.6% ,符合率为 91.4%。结论 :MRI多方位扫描是一种准确诊断交叉韧带损伤的方法 ,矢状位显示交叉韧带最佳。

Evaluation of the normal and injured cruciate ligaments of knee joint on low field MRI

Objective:To study the MR findings of normal and injured cruciate ligaments.on low field MR scanner.Methods:MRI appearances of 200 cases of normal cruciate ligaments were retrospectively reviewed and the MR findings of 25 cases of clinically suspected cruciate ligament injury were studied and compared with arthroscopic findings.Results:Sagittal plane was the best plane for revealing the anterior cruciate ligament(ACL) and other planes were complementary. The abnormal findings of tear of the ligaments included discontinuity,focal or diffuse swelling,high signal intensity and displacement of the torn ligament.Taking the results of arthroscopy as standarad,MRI revealed a sensitivity of 91.3%,specificity of 91.6% and accuracy of 91.4% in detection of cruciate ligament tear.Conclusion:MR imaging with multiple planes and sequences is an accurate modality to evaluate the cruciate ligaments of the knee,and sagittal plane is the best plane in displaying ACL.