What should you do 1 month post op? This is what my PT told me (on my 1st knee replacement). I was allowed to go to one store for 30 minutes, and I was to ride in the electric wheelchair when in that 1 store. (I was stupid and didn't...and I paid for it in a swollen leg and pain.) I was allowed to cook quick meals. I was not supposed to be on my leg for an hour or more. I was to quit using the walker and walk with a cane for another month (not everyone 1 month out was allowed to quit using the walker, but everyone one month out still was supposed to use some sort of walking aid). I was not supposed to sit with the leg bent. I was not supposed to do much of anything around the house except occasional quick, light housework...and then I was to rest again. And yes, sitting with the leg flat or elevated was what I was supposed to be doing most of the time. The reason is that at 1 month post op, your leg still wants to swell at the drop of a hat. Control the swelling, and you control the pain. Control the swelling, and you get bend faster and the leg loosens up faster. Control the swelling, and you can do more later. Control the swelling by not being on your feet so much. By feeling like you are being "lazy" now, you are speeding up your healing time.
At exactly 1 month out, I needed to take my daughter to have oral surgery. I drove about 45 minutes, sat around the doctor's office (with the leg up on their couch), and tried not to stand or walk too much. Then I drove her back home. So I was out and about for a half day (4 hours?), but I wasn't doing much during that time. I certainly wasn't doing anything that seemed stressful on the leg. Yet, with that little bit of being on my feet and sitting in car with the knee bent, it caused problems. The result was a painfully swollen leg that took a couple days to reverse. That is an example of what you should not be doing at 1 month out.