In today's world of sports, the human body is subjected to heavy training and numerous exercises. Unfortunately, injuries are an integral part of sports. The knee is one of the most frequently injured joints during sports activity, be it at a recreational or professional level. Movements that can be performed in the knee joint are flexion and extension, and external and internal rotation, which unlike flexion and extension have very little range of motion. It is precisely because of the small range of motion of rotations that the knee suffers strong strains during activities in which sudden changes in the direction of movement are encountered, for instance, jumps and landings, especially in contact sports. This is how injuries such as luxations, fractures, and ruptures of ligamenst occur, which can remove the athlete from the field for a shorter or longer period depending on the type of injury. More serious knee injuries are ligament ruptures (anterior or posterior cruciate ligament or collateral ligament), and injuries of the articular bodies of the knee (medial and lateral meniscus or articural cartilage). Injuries can also be of a minor type, so rest and physical therapy is sometimes enough for them, while more severe injuries require a surgical procedure. There are also specific knee injuries that are typical of certain sports in which the knee joint encounters a large number of repetitions of one movement, as with long and high jumpers, basketball players, and volleyball players, in which the "jumper's knee" overuse syndrome occurs. A similar injury is the "swimmer's knee" that occurs in swimmers and water polo players. Degenerative joint diseases can also cause injuries when the knee is strained during sports activities, such as osteoarthritis, which is primarily caused by aging, but also by other factors that cause it such as the consequences of previous injuries, congenital deformities (X and O legs), excessive loads (obesity), and metabolic disorders.