A medial collateral ligament (MCL) tear affects the inside of the knee. The tough MCL ligament fibers that connect the end of the femur (thigh bone) and the top of the tibia (shin bone) can tear, ...

Figure 1. Left knee T2 MRIs are shown demonstrating a radial tear (red arrows) of the medial meniscus posterior root on coronal (a) and sagittal (b) imaging demonstrating the “ghost sign.” ...