Multimodal Treatment of Knee Osteoarthritis: Therapeutic Exercise and Noninvasive Neuromodulation (NESA) Versus Therapeutic Exercise and Transcutaneous Electrical Nerve Stimulation (TENS) in People Over 60 Years of Age.

Inclusion Criteria: * Individuals over 60 years of age. * Diagnosis of knee osteoarthritis in at least one knee according to the clinical criteria of the American College of Rheumatology. * Ability to walk independently without the need for assistive devices. * No medical contraindications to physical exercise or the application of noninvasive neuromodulation (NESA). * Ability to understand and sign the informed consent form to participate in the study. Exclusion Criteria: * Present medical contraindications to physical exercise or the application of noninvasive neuromodulation (NSA) (pacemaker, epilepsy, internal bleeding, acute febrile processes, acute thrombophlebitis, and/or phobia of electricity). * Present active oncological diseases or systemic autoimmune diseases. * Present severe psychiatric or neurological disorders that limit understanding and collaboration in treatment. * History of any surgery or fracture of the affected lower limb in the last 3 months. * Presence of severe gait or balance difficulties that impede the performance of the proposed exercises. * Simultaneous participation in other clinical trials.