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It's OK to talk about your legal, prescription drugs on here. We just don't allow discussion of illegal ones.
The only reasons I can think of that your surgeon gave you the OK to drive are that he either forgot how early you are in recovery (and with bilaterals as well) or he forgot you are still taking heavy-duty narcotics. Perhaps he had a "senior moment".
It's not a good idea to start driving right now - and I think you're correct that your surgeon would probably deny having told you that driving would be OK.
I started driving again at about 5-6 weeks after one TKR. Before I did it, I used to sit in the car and practice moving my feet from one pedal to another. I did a couple of practice emergency stops as well - all with the engine turned off. Then I progressed to a slow test drive, up our long driveway.
I was off the heavy-duty narcotics and my head had cleared from the "brain fog" that afflicts many of us after this surgery.
My personal test to myself was "Am I 120% sure that I would be able to stop in time, if a child ran out in front of my car?" Until I could answer "Yes" to that, I stayed off the road.