There's risk to every surgery, but I've heard both of those are pretty safe. Either way, I don't care as long as it stops hurting because I really can't take it anymore. The problem with a replacement is that they wear out and that they're much more likely to dislocate, and since I'm only 23, I'd have to have another replacement somewhere down the road if that option was even on the table. Preservation means I can get back to normal and not worry about being careful because it's still my bones. Sucks to be them, they're going to be stuck there for a minute >__>