FWIW, As I've mentioned before I have not been using the leg press for strength training. I only use it to hold the flexion position, providing a moderate stretch, and I don't swell any more or less as a result of doing so. The lowest weight on the machine at my gym is 10# which is what I always set it at and so it ends up being about a 5# press on each leg which is probably less than I have to press walking up stairs or slightly more than biking with resistance. I only do 5, holding in the flex position for a few minutes at a time, then hold in the extend position. I didn't use the leg press for strength prior to TKR and don't expect to do so after.
For me, squats (not too deep), lunges, and crab walks with bands are actually much more effective for strengthening quads and hamstrings as they are more dynamic and require activation of more stabilizing muscles. Plus they are more akin to everyday movements.
@JJ65 - the total gym is different. They have one at my PT clinic. Before I could do a pedal revolution I used it to warm up and loosen up my knee prior to PT, just sliding up and down with no resistance. After I could pedal, I switched over to the bike for warming up. There is not a total gym at my exercise facility so that is kind of what I have been using the leg press for - just to provide a moderate stretch in the flexion position. But I am at 5 months - I would not have done so even a month ago due to the 10# resistance on the leg press.
@Polkadot - I tend to think in non sequiturs so did not even notice

. . . good win yesterday over Iowa. . . big game next week. I fear we will be on opposite sidelines.
@VW54 - not sure why PTs don't caution about the leg press or other machines. Probably the same reason they still push/force knees to bend. It is frustrating to get mixed messages about all of this. As an example, just a few posts earlier,
@Celle said no weight machines for at least 6 mos and
@Josephine said a year. That's a pretty big difference. Which is it? Inquiring minds want to know.
@liam2015 - after several weeks, the kneeling feels more comfortable. The picture doesn't show it well, but I was holding a pull-up position, so did not have all my weight on my knees. And the pad is pretty cushiony. I have not yet tried, but will hope to be able to kneel on a cushion in my garden next summer.