The knee joint is a complex joint that doesen't have bone stability, but the stability of the patella is enabled by muscles and ligaments. As the largest sesamoid bone in the body, patella provides a mobile insertion for the m. quadriceps femoris tendon and the patella ligament. Patella's primary biomechanical function is to improve the efficiency of the quadriceps femoris by increasing the lever of the extensor mechanism. Chondromalacia of the patella is a disease of hyaline cartilage that results in its softening. Consequently, a disruption of the extensor mechanism of the knee occurs. The etiology itself is incomprehensible, but it is believed that the causes may be injuries, generalized patellofemoral contact disorder, or consequences of articular cartilage chondrocyte trauma. The main symptom of chondromalacia is pain that varies in location and intensity. The second symptom is described as the sound of "creaking" (crepitation) under the patella. Fluid in the joint can be seen in an acute episode of patellar subluxation. Atrophy occurs in chronic and often recurrent conditions. Primary diagnostic procedure is radiography with added arthrography. Physiotherapy assessment in chondromalacia is based on observation, palpation, range of motion measurement, manual compression and specialized tests. In addition to the usual procedures such as R.I.C.E therapy and immobilization, the treatment also uses manual methods such as PNF, MCT or kinesio taping. Isometric exercises of the quadriceps femoris and leg stretching exercises form a vital part of conservative therapy as well as preventive therapy. TENS, neuromuscular electrical stimulation, therapeutic ultrasound, pulsed shortwave therapy, laser and other forms of physical therapy can be used as adjuvant therapies in addition to kinesitherapy.