I too had a RSR due to bone on bone pain. My ex-ray showed chips from the bone friction and I experienced increased pain and restricted movement. After injections and months of therapy with little relief, a replacement seemed the reasonable choice. I made the mistake of trusting the advice of the surgeon and go with the reverse procedure rather than the traditional approach. A second surgeon's opinion thought the reverse wasn't necessary but I trusted the first surgeon because he stated the outcome would result in greater relief.
Well, the result did reduce the pain to a moderate level almost immediately. BUT, my range of motion decreased even after many months of therapy. In fact my shoulder and elbow became close to frozen. I was told the range of motion may be reduced but it's worth it if the pain decreased. I'm so unhappy with the results and of course my pain increased again especially as the therapist tries to straighten it passively each week. The doctors do not disclose the facts accurately about the real outcome for many patients. I'M SO MAD with the medical establishment - especially the surgeons.