I went through a complete shoulder rebuild in 2010. Dislocated my shoulder so bad my arm was stuck sticking out at 90 degrees, and down where my armpit was. Complete rotaor cuff, labrum and bicep tendon tear. Think pulling off a turkey leg. After a 6 hour surgery and 9 months of intense rehab, that arm now feels like it did when I was 20. Not sure how my injury relates to a full replacement, but I think it would be similar. I'm still skiing, and my shoulder is not even an issue.