前交叉韧带撕裂的MRI诊断

目的:研究膝关节前交叉韧带撕裂的MRI表现。方法:回顾分析30例经关节镜证实的前交叉韧带撕裂MR图像及40例完好的ACL,分析其直接及间接征象的特征。结果:在评价的直接征象中,ACL不连续和ACL走行异常均具有相对高的诊断敏感性、特异性;在评价的间接征象中,后交叉韧带角、Blumensaat角、后交叉韧带指数、半月板后移征、“对吻性”骨挫伤、胫骨前移位等6个征象具有相对高的特异性,后交叉韧带角、Blumensaat角具有较高的敏感性。结论:ACL损伤的直接征象为诊断主要依据,ACL损伤的间接征象具有辅助诊断意义。

MRI diagnosis of tears of anterior cruciate ligament

Objective:To investigate the MR findings of anterior cruciate ligament(ACL) tears.Methods:MRI of 30 knee joints followed by arthroscopy were retrospectively evaluated.There were 40 knees with intact ACL.To investigate direct and indirect signs of them.Results:All the direct signs,discontinuity of ACL and abnormal contour of ACL had relative higher sensitivity,specificity.Most of the secondary signs,however,had relative high specificity.The following 6 indirect signs,angle of the posterior cruciate ligament,angle of the Blumensaat the index of the posterior cruciate ligament,uncovered posterior of lateral meniscus,"Kissing"bone bruise,and anterior tibial translation,angle of the posterior cruciate ligament and angle of the Blumensaat had relative higher sensitivity.Conclusion:Direct signs were the main clues for diagnosing.Indirect signs were only for assistant diagnosis.