What surgery? I possess 2 TKRs! No.1 was fine. No problems whatsoever. No.2 was preceded by knee arthroscopy, which IMO was a waste of time, and money. He could have done the TKR straightaway, which also turned out fine.
I guess you've already reached the pain threshold, which is the determining factor as to whether you go for a TKR or not!
No problems with the surgery; had to stop taking Warfarin for 4 days prior; no problems with that either!
Just the usual ones associated with hospital stays; go in with one thing and come out with another; usually cellulitis!
Good Health and Good Luck
Btw there's a parallel thread running on TKRs