@Jajakio, I don't know if anyone has told you this as yet, but you are doing remarkably well for just 4 weeks post-op! Truly, you are, and your ROM is fabulous for this point in time.
I can see how your work would be tricky since it requires two of the more difficult aspects of recovery; driving and lots of sitting with the leg down. With any luck, both will improve quite a bit over the next 2-3 weeks.
Like you, I also have another knee that needs replacement, but....I'm holding out for at least a year unless something dire occurs to force my hand. I decided on this path because I want some lengthy, quality time that isn't knee-centric. In other words, I need a break, and my husband does as well.
At 11 weeks post-op, I am still in PT, but I actually enjoy it and find it very beneficial. I've had a slow recovery with very hard-won flexion, and feel I need all the help I can get. My PT is of the "Less Pain=More Gain," philosophy, so it's not a hardship to attend. So far, insurance has not been problematic.....*knocking on wood*. My OS wants me to continue for the next 4 weeks in the hope my flexion will improve to at least 105-110 degrees. It's at 94 degrees right now, so that's certainly within the realm of possibility.
At 4 weeks, I still needed daily naps, often more than one, and was able to slowly taper of the Rx pain meds. I found a big increase in energy between weeks 6-8, and that was a most welcome surprise.

Like you, I was not able to go up or down stairs, foot-over-foot at 4 weeks, (not sure if anyone can?) but going up became possible around Week7. Not gracefully, but possible; hah! Going down was just achieved this past week! It's a really exciting moment and one you will enjoy enormously.
So, be patient, and good things will come your way very soon. Hang in there!
