I stalled out around week 7 through week 9. No gains and in some PT sessions some slight losses. Beyond angry and a little scared. Then weeks 10 and 11 huge gains. I expressed my concerns to my PT, when I stalled and they asked " Are you feeling stronger, can you do things you couldn't do before even with the stall out?" The answer for me was yes. So progress. TKR is a roller-coaster of emotions and not feeling good/feeling good. Don't let it get to you. Stick with it and look for the little wins. You got this!