Rotator cuff injuries can usually be successfully treated without the need for surgery. However, sometimes you may need to have an operation, e. g to repair a tear in your rotator cuff or to remove calcium deposits. Rotator cuff repair surgery is done under general anaesthesia (you're asleep during the operation). In general, there are 2 procedures that may be used to repair a rotator cuff injury: open surgery and shoulder arthroscopy. The type of surgery you have will depend on where your injury is and if it's a tear, how big it is and it's shape.
Attribution: BUPA