@contentandwell : I am also an old woman, 70 in a few months, and have been fairly active all of my life. Which probably helped me sail through 2 arthroscopic shoulder surgeries in the past. 3 months and 29 days - I was counting - after right shoulder I was back playing tennis with a full service motion. No OOMPH behind it, but still. The TKR has been more of a slog. However, yesterday morning when I lifted my hands from the usual routine of pushing the knee flat, it stayed down! Yeah! Will keep at it. Regarding gyms: I have a hate-hate relationship with them, even though I have used them on and off in the past. Much prefer outdoor or “real-life” exercises: walking, swimming, gardening, hiking+tennis to be resumed soon.
I am not sure I would have the guts to undergo surgery again to gain more flex since otherwise you seem to be doing great. How you can sit way up at the recumbent bike with limited flex I can’t imagine. Not officially measured, but I improvised with protractor and iPad display of angles to compare, and I’m probably around 135 flex, and would not even consider getting up close on the machine.
Lastly, life is not fair! Just heard from a friend of mine that her college buddy, age 77, moderately overweight, mostly couch potato, had TKR, never needed a single prescription pain pill, and was walking normally at 10 days. Aargh!!!!