In this study, research was conducted on patients suffering from osteoarthritis of the knee. The aim of the study was to evaluate the effectiveness of therapeutic exercises with a therapeutic laser compared to the therapeutic laser in treating patients with osteoarthritis of the knee and evaluating the recovery rate. Osteoarthritis is defined as a disease of the locomotor system of initiation characterized by progressive reduction of the joint cartilage and the formation of osteophyte and subhondral bone. Subjects were divided into two groups according to planned therapies: therapeutic laser treatment ( group A ) and therapeutic exercises and therapeutic laser therapy ( group B ). Tests that were conducted in this study at the beginning and after the end of the therapy include a Knee Problems Questionnaire, Visual analog pain scale, testing the measurement of the lower extremity strengthand measuring range of motion. Different therapies have shown different effects, we can conclude that the group of therapeutic exercises and therapeutic laser contributed more to the increase of the movement range ( p = 0,01 ), measurement test from the number of lifting from the chair through 30 seconds ( p = 0,03 ) from the therapeutic laser group and contributed to an increase in the value of pain factors ( p = 0,05 ), symptoms ( p < 0,01 ), and activity ( p < 0,01 ) in the Knee Problems Questionnaire.