@lkinny I will be thrilled if I reach 125° flex. A woman in my water class had a TKR recently and claimed she had 145! I doubt it. The aim generally is to get to 120° minimum, which I am not at. I have not been measured since I had PT. The NP at the ortho just looked at it and knew it was under 120°.

My ortho loves recumbent bikes and water jogging. I don't suppose the water jogging pushes the flex like you can on the bike but it does help to build strength. He is also opposed to overly aggressive PT.

I googled the X-10 and here is the website on it: https://x10therapy.com/. It sounds interesting. I will check with my ortho before I have the lysis. I did not see where it gave the cost on the website. Do you recall what it cost to rent it? Thanks.
JK

@lkinny : I know that I am super lucky and the exception with good flex. I never considered it as “only”, but as wow! Granted, my measuring is improvised and not perfect, but here it goes: once I have gotten the knee nice and loose when laying on my back doing heel slides, I bring the good knee up into the same position (heel distance from butt). I slowly sit up, double check that I did not cheat, then relax the TKR leg and use a compass to measure angle on the good knee (anklebone to hipbone, with a thin long dowel where the pencil would go in the compass, so it is fairly accurate in positioning). Then the angle can be measured with a protractor. Another indicator would be that when I kneel on the TKR leg (pillow, of course!), I can get my skinny butt to within 3” of my heel with foot flat on floor. On the other hand, it took me 4 months to get full extension, and I still work every day on keeping it! Go figure!
Regarding water exercises for knee bend: I was given a program that involved sumo squats (wide stance deep squats), front bent knee raises toward chest (fast up, down slow), and knee bends (facing pool wall lifting heel to butt, again, fast up, slow down), and lunge walks. I think those exercises did help a lot in making the knee more flexible.

In regard to your "setback": I had first knee done 6 mos ago during summer warm weather. I live in cold winter climate. My other knee was done in October. I have much slower rehab progress with the second one in that I have severe stiffness. I have great strength and great flex, but it is so stiff that my gait is not back to normal like it was at 6 weeks with the one done in the summer. I do water exercise and within 15 minutes out of the warm water it stiffens right back up. I can warm it up on bike as well, but stiff again soon. My doctor warned me that winter would be more difficult at my 6 week check in November. Boy was he right! Might this be your problem as well?