Inclusion Criteria:  Age > 18 years old; Supraspinatus tendinosis detected by MRI.  Exclusion Criteria:  Supraspinatus rupture; Previous shoulder surgery; Rotator cuff tears secondary to fracture; Hemoglobin <7 g/dL or Platelets < 30,000 microL; Active infection; Pregnant patients; Patients with hematologic and oncologic diseases.