Osteoarthritis is the most common joint disease, most often affecting the knee joint. Pain is the first symptom that appears when performing movements in the knee joint, which can lead to limited movement. Osteoarthritis diagnosis is carried out through anamnesis, clinical findings and radiological images. Treatment of osteoarthritis of the knee is divided into conservative and surgical treatment. Conservative treatment is carried out in patients with degrees 1 to 3 of development according to Kellgren-Lawrence, where pharmacological and physical therapies are used to reduce pain. Surgical treatment is performed when conservative treatment procedures no longer give positive results. Rehabilitation begins with a physiotherapy assessment, which is carried out by S.O.A.P. method, after a subjective and objective examination and analysis of the obtained results, an individual physiotherapy plan is created for each patient. Physical therapy consists of muscle strengthening exercises, range of motion exercises and aerobic exercises, as well as physiotherapy procedures where electrotherapy, ultrasound, laser, magnetotherapy, hydrotherapy, thermotherapy and balneotherapy are applied. A very important part of the rehabilitation of patients with osteoarthritis of the knee is education. It is necessary to inform the patient about the disease, possible symptoms, treatment and therapy plan. It is also important to involve his family and/or guardians, in order to make it easier for him to adapt to the new situation.