Hi @clvclv Welcome to Connect. I have had two TKRs but never had what you are experiencing. Actually I also didn't realize that the IT band extended to the knee, I thought it was just in the hip area.
I wish I could give you some advice but as I said my TKRs both had no problems except only getting to about 120 degrees flex, more or less.
Have you spoken to your orthopedic surgeon about it? If so what does he or she say? Most physical therapists are very good but I pretty much rely more on my doctor.
I will be interested in hearing what your orthopedist does have to say.
JK