Mesenchymal Stem Cells in Rotator Cuff Repair

Inclusion Criteria: * Full thickness posterosuperior rotator cuff tear, of small or medium size, fully repairable at the time of surgery, regardless of size; * Pain and / or decreased shoulder function for at least 3 months, with no improvement with non-surgical treatment; * Absence of the following changes in MRI: * Fat degeneration of the rotator cuff musculature of grade 3 according to the classification of Fuchs (presence of equal or superior amount of fat compared to muscle fibers); * Absence of the following changes in radiographs * Advanced glenohumeral arthrosis (grades 2, 3 and 4 of Samilson and Prieto * Signs of rotator cuff arthropathy, according to Seebauer classification; * Skeletal maturity; * Absence of surgeries or previous fractures in the shoulder in question; * Absence of psychiatric illnesses, fibromyalgia or painful pathologies of the cervical spine; * Absence of rheumatic diseases or chronic use of corticosteroids; * Absence of active or recent infection; * Absence of thrombocytopenia, coagulopathies or chronic use of anticoagulants; * Absence of vascular or neurological lesions affecting the upper limb; * Absence of pregnancy; * Clinical non-compensated comorbidities; * Chronic use of corticosteroids; * Consent to free and informed consent; * Live in Brazil. Exclusion Criteria: * Visualization during the operative event of one or more of the findings: * Irreparable rupture of rotator cuff; * Subsecapularis tear involving two thirds or more of its extension; * Need to open surgery.