Just a randomn question. I would guess a big problem with revision of adr is the fact they have keels or spikes to stay attached to the bone. If the new ones that dont have keels but use that chemical attachment instead are implanted, will their revisions be more feasible and less dangerous. I know as of now you still have to do the anterior approach so you have the major vessels to worry about, but would this new attachment method make replacement actually viable and alot less complicate? I think the 3df they got coming up is going to be awesome, but the ranier CA they already have made looks good too. Thanks for any thoughts.