Inclusion Criteria:  preoperative magnetic resonance imaging (MRI) diagnosis of a large - massive sized rotator cuff tear (>3cm), which was confirmed during operation chronic tear older than 17 years and younger than 75 years without surgical contraindications and willing to participate  Exclusion Criteria:  poor quality rotator cuff and irreparable tear severe glenohumeral arthritis previous shoulder surgery accompanied by dislocation or fracture of shoulder refusal to participate