The knee joint is the largest and most injured joint in the body. It consists of the tibia, femur and patella, which form the femoropatellar and tibiofemoral joints. The muscles that act in knee movements are the anterior, posterior, medial, and lateral thigh muscles. The main carriers of stability in the knee are ligaments that divide into collateral ligaments and cruciate ligaments of the knee. Collateral ligaments are divided into medial and lateral collateral ligament while cruciate ligaments are divided into anterior and posterior cruciate ligament. In the anterior cruciate ligament there are small bundles of fibers, posterolateral and anteromedial bundles. The anterior cruciate ligament is the most commonly injured ligament in athletes. Women have a higher risk of injury due to incorrect landing techniques. Injury is more common during non-contact mechanisms so it is essential as an injury prevention to have frequent jumping workouts. Anterior cruciate ligament injuries can be divided into sprains, partial ruptures, and complete ruptures. In the first stage, only pain and swelling occur. In the second phase, along with pain and swelling, there is a loss of some of the functions and instability in the joint, while in the third phase the knee is no longer stable and is not able to control the movements in the knee. Treatment can be conservative or operative. A more successful postoperative recovery can be expected if preoperative rehabilitation is started before the operation, the goal of which is to reduce pain, swelling and restore range of motion. Kinesitherapy is the main method of treating LCA injury. Strength exercises, range-of-motion exercises and proprioception are performed. The goal is to restore early functional activities and the full range of motion of flexion and extension. In the knee joint, active flexion is possible from 0 ° to 135 °, and passive flexion is possible up to 160 °. Each patient is approached individually.