Joe, I've not had surgery, but I do have a cane, scooter and wheelchair and what a joy (not!) .

I'm not making light of your questions, which I think are excellent. I can't guarantee this, yet I'm fairly certain that there have been people, who posted at the BT SD forum, who mentioned having more than one surgery for the "domino effect," revision and/or for further problems that arose (same level as previous surgeries).

I don't recall their names and, since I can't access the BT forums to search by keywords, I'm at a loss on how to access the info. they had passed along.

I hope that, at least, a few read your message and won't mind sharing again .