I had TKR back in January 2019. I continue to build scar tissue that comes back right back. My PT claims "I lay scar tissue down faster than he has ever seen it. I'm working with my Doc ..mostly with NSAI's with on and off reduced tightness. I'm very active bikeing and Yoga all have made my leg strong but not without a lot of warming up to get it moving.
I'm sorry your are having do much trouble and I hope they solve the problem soon. Mine is minor in comparison if my blood work is clean no infection or bone problem I get ND MRI as I do have other issues a Burser, tendonites, AC issues. Again so sorry I can well imagine how hard it is. Hope you get ANSWERS SOON.