The Meniscus is a rubbery cartilage disc that provides cushion, support and stability to the knee. Ligaments are structures that hold the four bones of the knee together (patella, femur, tibia, and fibula) and allow it to function properly. Common injuries include meniscus tears, ligament sprains, knee dislocations, and complete tears of the ACL, PCL, LCL, PLC, MCL, and MPFL.