@bushy : you are at a very early stage in your rehabilitation. I’m sure you follow all instructions given to you by your therapist, and as time passes, any stiffness of the knee will diminish. I had my TKR in September of 2018, and while the knee does get sore or mildly painful if I overdo things, I never ever have any kind of stiffness – not even after a 10 hour flight, sitting wedged in the cheap, narrow airplane seats. That being said, I hate to rain on your parade…. I love to garden, but even with a flex of well beyond 130 there is no way to kneel comfortably. I have tried knee pads, but they are not really helping. The problem is not that I can’t kneel, it’s when I need to lean forward and put weight on my kneecap, as in pulling weeds, that’s a no-no. I have one good knee left, so I can at least kneel one-sided, but it does put a lot more stress on my back. However, as long as I can get the work done, even if it has to be done an hour or so at a time, I’m ok with that.
Wishing you continued success in your recovery!