Efficacy of Percutaneous Electrolysis in the Treatment of Achilles Tendinopathy

Inclusion Criteria: * Presence of symptoms in one or both Achilles tendons with a minimum duration of two months. In case the symptoms are bilateral, the intervention or placebo will only be administered and its results evaluated- in the limb with greater symptomatology. If it is not possible to differentiate which one presents greater pain, the right Achilles tendon will be chosen. * Spontaneous pain of at least three points measured by a visual analog scale (VAS), reproducible by palpation between 2 and 6 cm above the insertion of the Achilles tendon in the calcaneal bone. * Evidence of tendinopathy by MRI. * Presence of post-static dyskinesia. * Willingness to not perform additional treatments (such as footwear modifications, physical therapy, orthotics, injections, or surgery) for Achilles tendon pain during the conduct of the trial. * Willingness to attempt to discontinue self-administration of medications (NSAIDs) for pain relief Achilles tendon(s) pain for at least 14 days prior to baseline assessment and during the course of the trial. Exclusion Criteria: * Presence or suspicion of pregnancy. * Previous surgical intervention on the AT in the symptomatic leg(s) * Total or partial rupture in the symptomatic AT * Chronic ankle instability, in the foot with symptomatic tendon(s). * Pathologies that can derive in pain in the region of the AT without being proper of the picture. (e.g.: osteoarthritis, impingement syndromes). * Presence of arthritis or any metabolic or endocrine disorder (type 1 or 2 diabetes). * Psychological disorders. * Oncologic history. * Treatment with quinolones or fluoroquinolones during the last two years. * Treatment with statins for the control of hypercholesterolemia for more than two months * Treatments within or at the periphery of the Achilles tendon, with anesthetics, corticosteroids or any other pharmacological agent during the last three months. * Needle phobia * Allergy to metal