This study is designed as a multi-centre randomized controlled trial with a priori sample size calculation of 28 patients per group. Patients presenting with unremitting pain, failed conservative treatment of at least 3 months, weakness of the rotator cuff and positive imaging indicating a full-thickness rotator cuff tear are eligible for the study. Previous surgery on the affected shoulder and massive rotator cuff tears are excluded. Patients are randomized using computer-generated block randomization, stratified by surgeon, to either open or mini-open rotator cuff repair.