InSpace™ System Over Rotator Cuff Repair in Comparison to Repair Alone.

Main Inclusion Criteria: * Age 40 or older. * Positive diagnostic MRI of the affected shoulder indicating full thickness large to massive RCT of at least 3cm in diameter (according to Cofield classification2) involving one or more tendons. (MRI can be done up to 6 months prior to randomization.) * Persistent pain and functional disability of the affected shoulder for at least 3 months. Main Exclusion Criteria : * Known allergy to the balloon material (copolymer of PLA and -θ-caprolactone). * Evidence of significant osteoarthritis or cartilage damage in the shoulder * Evidence of gleno-humeral instability * Previous surgery of the shoulder in the past 2 years, excluding diagnostic arthroscopy * Evidence of major joint trauma, infection, or necrosis in the shoulder * Partial-thickness tears of the rotator cuff