@Crlnagrl Just read your post. Sure hoping that it isn't infection.
I had left TKR 11/13 that became loose and had to be replaced on 3/15. That surgery went very well. Then about 8 months after that my knee started swelling and being inflamed. My OS suspected scar tissue build up and suggested arthroscopic surgery to clean it out. He found a lot of scar tissue and inflamed tissue. My knee felt so much better after that. Then a couple of months after that it all started again.
My OS was going to try another arthroscopic but wanted to do blood tests to make sure there was no infection. There was no swelling, warmth in the area, I had no fever and no illness. Blood counts were high so he did an aspiration. One week culture - INFECTION. Yuck.
I had surgery on 6/29. Removed my knee, flushed with antibiotics and put in an antibiotic spacer and two rods so I couldn't straighten my leg. Then 6 weeks of at home IV antibiotics. Waited one week off antibiotics and then another aspiration to make sure that the infection was gone.
Then he told me I had to quit smoking or he wouldn't do the replacement surgery. So, I quit smoking. Had the blood test to prove it.
I had my knee put back in on 10/8. On the road to recovery ... again. Well, I didn't mean to go on so much ... it's just my little story.
I don't know about imaging or that stuff but I do believe the best thing to have done is the aspiration and culture. I know you think you will never get done with all of this. Believe me...you WILL!!! Because you have to. You have no choice.
I can't tell you how many times I have told my husband to please just cut my leg off just above my knee. I think sometimes I almost meant it. Let me know what you find out. We all need support. Can't tell you how much the people at BoneSmart will help you. They are all lifesavers!!!