@joanhope6 good morning I like you have had unsuccessful tkr and a revision , over two years therapy, myofacial release , graston , you name it I have tried it. I am at 70-75 flexion extension I am 10-15 off normal . So I am a work in progress. I am doing therapy right now I gained 5 degrees in extension but nothing in flexion yet I am hopeful to gain anything. I understand the burning , you would think it would not hurt to exercise after so long but not the case for me. Hurts every time. I have Arthrofibrosis which means I have over abundance of scar tissue, so no matter what I do I tighten up again . So for me there is no more surgery so I just exercise 3 times a day it does help sometimes more than others . Whenever I start a new exercise though it aggravates the knee so found out I have to take a day or two off before get back to it . I am telling you all this. Because Sometimes there is no more surgeries. I was 59 when I started this journey. Few years older now definitely not as active now because I can’t do as much lol . But I was relieved when my dr told me that was it there was no more they can do . I personally could not go through another tkr I went through two within a year . It was the worst time of my life . The first tkr with the wrong size tkr was the absolute torture year . Than in that year no recovery was made just found out had have done again at year mark it was horrible. Than having it done again better recovery better numbers for few months only to lose it all because of scar tissue was cruel joke. I was so done with it all . So demanding physical and mentally. So now like I said I am at peace with my decision. Pt helps right now over the years I have found my own exercise program but pt helping right now because I was in car accident last year figure won’t hurt to do refresher course I lost 15 deg since car accident. But good luck to you. I hope you find what works for you .