Be patient. If mfr gave relief even momentarily, this is a lead to understanding the healing process. How long are you post tkr? I am 11 months out and about a month ago notice a bit less of that tight pressure and band feeling in the lower leg.
Too bad most Drs. Dont get taught about all the aspects that surgery interrupts with soft tissue recovery.
Don't give up hope and consider continuing with MFR with knowledgable therapist.
Hope this helps.