Inclusion Criteria:  Adults over fifty years of age with a diagnosis of knee osteoarthritis by radiography. Chronic pain of more than six months, compliance with the diagnostic criteria for knee osteoarthritis according to the Osteoarthritis Research Society International (OARSI) guideline (McAlindon et al.): Pain in Analog Visual Scale less than 4/10 Matutinal stiffness for at least 30 minutes Absence of hyperthermia upon palpation in the joint Alteration of the bone image and crepitation.  Exclusion Criteria:  Patients who can provide low-quality or biased information discriminated by the Mini-Mental State Examination (Score less than 24). Severe hearing, visual or sensory impairment or comorbidities that prevent the correct completion of the questionnaires and mobility activities. Patients who have undergone knee replacement surgery on the contralateral knee. Patients who have received intervention (infiltration, blockages, etc...) in the last 6 weeks. Pain due to tendinopathy, knee fracture, low back pain radiating to the knee, or fibromyalgia. Patients who decline to participate out of fear or denial of therapy. Severe heart disease that prevent exercise. Body Mass Index above 45. Patients with neuropsychiatric disorders (schizophrenia, epilepsy or bipolar disorders) or taking medication for these conditions (antiepileptic drugs). Patients with metallic implants in the area (skull or knee).