rhondavous, I like your name!
I had problems with my tailbone after my first tkr and I would classify it as sciatica. I noticed the pain as soon as the anesthesia wore off after surgery and even now, two years later, have problems with it from time to time. The pain in the butt was actually worse then the pain from the tkr. I was in PT for 5 months, partially because of the back pain and sciatica.
Between going to PT, exercising, using a heating pad, and time, it eventually got better. I wish I could tell you exactly what to do to make it better but this is about all I have to offer. Good luck.