Growth factors augmentation for arthroscopic rotator cuff repair

INTERVENTION: Study group: Arthroscopic rotator cuff repair and augmentation with platelet‐rich fibrin matrix (Cascade® Autologous Platelet System, Musculoskeletal Transplant Foundation [MTF]). Control group: Arthroscopic rotator cuff repair without augmentation with platelet‐rich fibrin matrix (Cascade® Autologous Platelet System, MTF). CONDITION: Rotator‐cuff tendon tear ; Injury, Occupational Diseases, Poisoning ; Injury of muscle and tendon at shoulder and upper arm level PRIMARY OUTCOME: Difference in change from baseline to 16 months in the Constant Score between the two groups. The Constant Score is a scoring system shoulder rating scale evaluating shoulder pain (15 points), activities of daily living (20 points), range of movement (40 points), and power (25 points). Total possible score is 100 points, indicating an asymptomatic and healthy person, while the worst score is 0 points. SECONDARY OUTCOME: Integrity of the repaired rotator cuff, as evaluated by MRI. INCLUSION CRITERIA: 1. Aged over 30 years, either sex 2. Rotator cuff tear diagnosed on clinical grounds 3. No episodes of shoulder instability 4. No radiographic signs of fracture of the glenoid or the greater or lesser tuberosity 5. Magnetic resonance imaging evidence of cuff tear 6. A repairable full‐thickness tear of the rotator cuff found at the time of surgery 7. Patients with associated biceps pathology are also included