Wow! You have a higher threshhold for pain tolerance than me..
The reason for the pain meds and the Spinal epidural before the knee surgery is because the doc is busy cutting up your Femur bone and your Tibia bone in order to fit the replacement knee. Lot of bone cutting going on and then they pound that spike on the lower part of the articicial knee down into your lower bone.. Nice.....
I don;t want to be awake, or partially awake to know, feel, hear any of those things... Just knock me out and let me sleep. When I awken it will be over except for the painful recovery... Please pass the pain ball!!! lol!!!!