MRI diagnosis of reverse and separation of meniscus articular capsule / 中华放射学杂志

ABSTRACT

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.