One of the largest and most complicated joints in human body is the angular and rotational joint of the knee. Due to its complexity, various structures in the joint are often injured, and one of the most common injuries is a partial or total rupture of the anterior cruciate ligament. This injury is very common in athletes but also in recreational athletes. The stability of the joint is provided by muscles and ligaments that surround it. Musculus quadriceps is a large muscle with four heads, that extends along the entire thigh, grasps the tendon and over the front of the knee for tuberositas tibiae, and its medial part of the muscle atrophies the fastest after the injury. The mechanisms of injury are various, the most common being the mechanism of sudden deceleration, the mechanism of knee hiperextension and the mechanism of valgus stress. In the diagnostic assessment, in addition to a detailed anamnesis and clinical examination, both the anterior drawer test and Lachman test are used, all of which are confirmed by magnetic resonance or arthroscopy. Depending on the patient's condition, conservative or surgical treatment is determined. The main goal of the rehabilitation and physiotherapy is to restore the functional status of the patient to the state before the injury, and the athlete to his training and sport. It also focuses on relieving pain, restoring mobility and increasing muscle strenght. In addition to movement physiotherapy, many other procedures can be used such as hydrotherapy, electrotherapy and postisometric relaxation.