when I had my knee flushed through with sterile solution, they also did a biopsy. on the morning of the surgery they came round and drew on my leg with black marker with a big arrow saying "this knee". didn't exactly fill me full of confidence that they needed to go to those lengths and that simply stating either left knee or right knee on the surgery notes was not sufficient.
still, I remember coming round and was still crashed out on morphine for ages, plus some extra later on once it wore off :D
