Analysis of the treatment of knee osteoarthritis using Photobiomodulation performed with a low power laser Ana Paula Pelosi Mota 1 , Salmo P Silva 1 , Alessandra Baptista 1 , Amanda FF Barros 1 , Ricardo S Navarro 1 , Livia Garcia 1 , Martha S Ribeiro 2 , Silvia Cristina Nunez 1 1 Universidade Brasil, Instituto Científico e Tecnológico- SP-SP 2 CLA-IPEN/CNEN – Usp-SP INTRODUCTION Osteoarthritis is a progressive degenerative process without cure, where the patient will present as main symptoms the increase of joint stiffness and pain, characterized mainly by the decrease or loss of articular cartilage, this situation may appear due to trauma, infections, heredity and even unknown causes, osteoarthritis of the knee (KOA) is a major cause of functional limitation, with a tendency to increase considerably throughout the world (1) (2). The main symptoms of KOA are functional disability and pain that is usually aggravated by movement and improvement with rest. Pain can become continuous and lead to functional disability, which reduces the quality of life. To establish a treatment plan for a patient with KOA, a multidisciplinary team should be involved and consider all components involved in this disease, from the degree of pain and its impact, affective aspects, quality of life, degree of joint damage, and also joint instability and deformities need to be evaluated in order to establish an adequate treatment plan (3). The main goals of the treatment of KOA involve patient awareness, pain control, improvement of function and reduction of motor incapacity. The treatment can include medication, surgery and physiotherapy. The physiotherapy with therapeutic exercises is fundamental for rehabilitation of patients with KOA, currently it is the most requested resource before any other intervention, its main objective is the reduction of pain, restoration or maintenance of physical mobility and to act in a preventive way in the degradation of joint tissue, because KOA is a chronic progressive disease (4). Electro physical agents should be associated with physiotherapy in order to obtain better results, such as ultrasound, shortwave, transcutaneous electrical nerve stimulation and low-power laser photobiomodulation (PBM) have been used to