Inclusion Criteria:  Patients older than 45 years old Unilateral or bilateral knee osteoarthritis. Kellgren and Lawrence (K-L) grade II or III. Visual analog scale (VAS) greater than 40mm. Affectation of more than one year of evolution. Sign and understand the informed consent form.  Exclusion Criteria:  Secondary cause osteoarthritis History of uncontrolled metabolic diseases. Decompensated or uncontrolled pathologies Tumor processes. Collagenopathies and neurological diseases. Changes in medication or invasive treatments at least 1 month prior to treatment. Receiving physiotherapy treatment or having received it one month prior to the start of the osteoarthritis study. Patients with alterations in thermal sensitivity. Pacemaker Skin alterations (recent wounds or burns). Knee prosthesis Thrombophlebitis