Effectiveness of TheRApeutic ExercIse aNd EDucation on Patients With Massive Rotator Cuff Tears

Inclusion Criteria: * Massive rotator cuff tear diagnosed by ultrasound imaging or magnetic resonance imaging. The definition of massive will be the rears including 2 or more tneonds, or the ones with an extension equal or greater to 5cm in the short or long axis. * To have a degree of disability equal or greater to 15% in the Oxford Shoulder Score. * Adequate comprehension of written and spoken Spanish Exclusion Criteria: * Loss of passive external rotation at 0º of shoulder abduction equal or greater to 50% compared to contralateral side. * Suspected neck-related shoulder pain. * Suspected visceral-related shoulder pain. * Humerus and/or scapular fractures within the last year. * Previous rotator cuff repair surgery within the last year. * Presence of cancer, fibromyalgia, neurological and/or other systemic diseases. * Cognitive impairment that makes it impossible to perform therapeutic exercise.