The aim of a rotator cuff surgery is to re-attach the tendon back onto bone. The tendon then needs time to heal back onto bone. Once the tendon heals to bone and the joint is mobile, the muscle needs to be re-strengthened. Early physiotherapy with incremented increase in rehabilitation is critical to allow for tendon healing and minimise stiffness.
Any surgical or invasive procedure carries risks. Before proceeding, you should seek a second opinion from an appropriately qualified health practitioner.