The anterior cruciate ligament is one of the major ligaments of the knee, which passes between the femur and tibia obliquely. Its function is to provide stability to the knee, keeping the leg is moved forward with respect to the thigh. Of the four major ligaments of the knee, the anterior cruciate ligament is the one most commonly injured, especially when a sudden change occurs in the direction of the knee. The most common injuries are torn anterior cruciate ligament and partial tear of the anterior cruciate ligament. Symptoms include pain, inability to walk or stand for long periods, or up and down stairs. For the treatment of both lesions can opt for surgery by arthroscopy or conservative treatment based on rehabilitation to strengthen the muscles.