Collagen Fiber-Oriented Pullout Repair for Medial Meniscus Posterior Root Tear of the Knee.

The medial meniscal posterior root tear (MMPRT) is a medial meniscal injury that is common in middle-aged and elderly patients. In many cases, MMPRTs require repair, since they result in the loss of circumferential hoop stress and are highly correlated with knee generation. Although clinical results of MMPRT repair have improved, poor results can occur if the tunnel position or reduction method is suboptimal. There are many reports on how to secure the meniscus, but there are few reports on how to create the bone tunnel. Here, we describe a method for creating a bone tunnel through a posteromedial portal for MMPRT repair. This repair can be performed along the fiber direction of the meniscus, offering the potential for more physiological fixation. In addition, the bone tunnel can be created in a more anatomically accurate position because the footprint is more visible than with conventional methods, without the need for special instruments.