半月板关节囊分离并反转的MRI诊断

MRI diagnosis of reverse and separation of meniscus articular capsule

目的探讨半月板关节囊分离并反转的MR表现。方法对8例经关节镜或手术证实的半月板关节囊分离并反转的MR表现进行回顾性分析。结果MR表现在经半月板体部的矢状层面上示“蝴蝶结消失”征8例,代之以液性信号,残留部分后角3例;于旁正中矢状面示“双前交叉韧带”征7例。经半月板体部的冠状面见髁间窝区“反转半月板”征8例。反转的半月板内呈现高信号6例,另侧半月板内出现异常高信号5例。结论半月板关节囊分离并反转的主要MR表现为“蝴蝶结消失”征、“反转半月板”征及“双前交叉韧带”征,同时具备三征或前两征即可确立诊断。

Objective To explore the MR imaging of reverse and separation of meniscal articular capsule.Methods MR imaging of reverse and separation of meniscus articular capsule confirmed by surgery and arthroscope were analyzed retrospectively in 8 cases.Results The “Butterfly knot sign” disappeared and was replaced with fluid signal on the sagittal slice of meniscal body in 8 cases. Part of back angle remained in 3 cases. “Double anterior cruciate ligament sign” was showed on one side of middle sagittal slice in 7 cases. “Reverse meniscus sign” was revealed in intercondylar fossa on the coronary view in ~8 cases. Abnormal high signal was showed in the injured meniscus in 6 cases. Abnormal high signal was detected in the opposite meniscus in 5 cases.Conclusion The MR findings of reverse and separation of meniscus articular capsule include disappearance of “butterfly knot sign”, appearance of “reverse meniscus sign” and “double anterior cruciate ligament sign”. The diagnosis would be established if the former 2 signs were present or all the 3 signs were present simultaneously.