Magnetic resonance diagnosis of posterior horn tears of the lateral meniscus using a thin axial plane: the zip sign—a preliminary study

Objective The “zip” sign is a newly described form of meniscal tear progressing from the distal insertion of menisco-femoral ligaments (MFLs) through the lateral meniscal wall; the tear occurs during anterior cruciate ligament (ACL) rupture. The purpose of this study was to evaluate the zip sign on knee MRI within the context of ACL injuries.