MRI: A CASE REPORT HIGHLIGHTING NEW POTENTIAL PITFALLS IN MRI SIGNS OF DISPLACED MENISCAL TEARS

Abstract

For meniscal injuries, MRI has been proven to be an excellent modality in imaging. Various MRI signs have been described to detect displaced meniscal injuries, specically the bucket-handle tears. Although these signs are useful in identifying meniscal injuries, they have also been linked to a number of pitfalls. The presence of a linear hypointense soft tissue anterior to the ACL, which indicated the ipped bucket-handle rupture of the meniscus, is known as the double anterior cruciate ligament (ACL) sign. Asymmetrically thickened horns of the menisci due to overlaying displaced meniscal fragments cause disproportional posterior horn and ipped meniscus symptoms. We present a case in which an MRI of the knee revealed a tear and dislocation of the medial patellofemoral ligament (MPFL), vastus medialis complex, medial collateral ligament (MCL), and posterior cruciate ligament (PCL) that matched these symptoms. Internally displaced MPFL and MCLs have not yet been described as mimics for displaced meniscal fragments, to our knowledge.