Hi escapequeen,
Sometimes I just have to turn into some kind of cyberlibrarian and go into the stacks in the basement of TOTV and pull out an old thread that might help someone who may have missed it.
This thread is from a few months ago and it is about something that happened with a friend's surgery. It had to be rescheduled when she found out, on her own, that the replacement knee contained nickel. She is allergic to nickel. So at the time, I passed this information along here in case it could help somebody else.
Good luck to you with your surgery, and here's the link to the old thread, that has a little added information.
What's in a knee? (maybe better be sure)
Boomer