Efficacy of Therapeutic Percutaneous Electrolysis Simple vs Multifiliar Therapy in Supraspinatus Tendinopathy.

Inclusion Criteria: * Signing of informed consent both to participate in the study and to undergo invasive physiotherapy techniques. * Presence of symptoms (inflammation or pain) ≥ 4 weeks. * Positive palpation test of the supraspinatus tendon. * Men and women over 18 years of age. * Score of 3 or higher on the shoulder pain analogue scale. * Adequate cognitive ability for understanding. * Limited range of motion. * Rotator cuff tendinopathy confirmed by ultrasound at the study centre, either due to tendon inflammation, presence of hypoechoic areas, calcification, fibrillar disorganisation and/or neovascularisation in the supraspinatus muscle. * Pain in the proximal lateral part of the arm that worsens with abduction. Exclusion Criteria: * Any related acute or chronic musculoskeletal disease that may affect the results of the study. * Presence of neuropathic pain such as lumbar radiculopathy, which may affect the results of the study. * Not receiving the treatment sessions and assessments of the study. * History of glenohumeral fracture and rheumatoid arthritis. * Rheumatic, neurological or structural polymyalgia affecting the joint. * Pregnancy. * Patients with cardiovascular disease. * Patients with neurological disease. * Local infection. * Tumours. * Belonephobia. * Taking anticoagulants or antiplatelet agents. * Infiltrative and/or rehabilitative treatment in the two months prior to recruitment. * Treatment with another intervention during the study.