ComprKnee joint over one million times per year and as a result it is one of the most injured joints in your body. Your knee is more vulnerable to injury because it is one of the most mobile and flexible joints in your body. The more mobile a joint is… the less stable the joint is and thus, the more vulnerable it is to an injury. Your knee is made up of three bones carefully designed to provide smooth, stable motion. These bones are called the tibia (shinbone), the femur (thighbone) and the patella (kneecap). These bones are enclosed in the joint capsule lined with a special tissue called synovium, which produces a thick liquid called synovial fluid which is necessary to lubricate, protect and nourish your joints. On either side of your knee there are another set of stabilizing ligaments called the collateral ligaments. There are two major sets of these ligaments. On the inside part of your knee (the side closer to your other knee) this is called the Medial Collateral Ligament (MCL), the other is on the outside of your knee (the side closer to your hand) which is called the Lateral Collateral Ligament (LCL). They supply stability when your knee moves from side to side or when you make any sharp cutting moves.