Thanks, Chris. @autp17 According to my physical therapist a tight IT band is a common problem without having had knee replacement surgery, and she has recommended using a foam roller to me. I see @autp17 you've tried it and it was painful. It is uncomfortable for me too. The IT band passes over the grater trochanter and I found this post on facebook that described tightness and adhesions there as a potential problem from "The Body Mechanic, Inc."

"A lot of people get pain on the down side hip when laying on their side. In my experience, this is most often caused by adhesions around the greater trochanter. It serves as an attachment point for several muscles and is prone to a lot of restriction. While it won't clear the adhesions, rolling on a lacrosse ball AROUND the trochanter, but not on it, can soften things up enough to help."

Here is a link to the post that shows an illustration https://www.facebook.com/ActiveReleaseSonomaCounty
Here is their description of myofascial release. https://thebodymechanic.com/active-release-technique-blog/self-myofascial-release/

I have been doing myofascial release for several years with good success and it's been part of all the rehab I have done for thoracic outlet syndrome, spine surgery and my recent ankle fracture. When you lay on a foam roller, essentially you are doing this, but if that is too intense, find something softer or smaller, a small ball partially inflated, a pool noodle, a strap that you can wrap around your leg to pull against the skin or get a friend to push with their hands. Only go as far as you can without intense pain and hold it. You go to the barrier and wait. A PT does this by sinking their hands into your skin and pushing with a shearing motion and holding that pressure until the fascia begins to slide. You might have enough tightness built up that it will take several sessions before it starts to feel better. Surgeries create fascial scar tissue that contribute to this tight tissue. Perhaps working around the greater trochanter to start will begin to break adhesions between muscles. These are really painful, but when everything can move again as it should, it makes a big difference. Working with a PT skilled with rehab after knee replacements is good. If you try some MFR work, that might get better. They can do some Graston tool work too which pushes against the skin with curved metal tool to work the fascia. Sometimes they uses a cold laser to reduce inflammation.

Here is our link to our myofascial release discussion where you can find a lot of information. There is a provider search on the MFR website.
https://connect.mayoclinic.org/discussion/myofascial-release-therapy-mfr-for-treating-compression-and-pain/

I am doing Active Release Therapy (ART) and the first treatment seems to be helping. I will check out if this doesn't help me. Thanks for all the information.
Terri