Good to hear from you again, Arrangrl!
I can relate to this pain! I probably have a similar pain when I stand up from being seated and I worked on it with a Pilates person I'm able to get back in to see. She analyzed what I was doing and it was that my good 'ol butt muscles were still trying to be on vacation! She has given me some exercises to do at home to recruit the glute muscles to working again, something they got to sit out when I was so favoring this leg prior to surgery.
I recall my PT reminding me to use my butt muscles, too, before I was released form PT, so it seems, in my case, at least, to be a thing I'll just need to work on. What I do now, is, before I stand up, I deliberately, thoughtfully remind my glutes to activate, and, lo and behold! My knee isn't as sore! So, for me, this is helping. Maybe talk to your PT about it, too? They might be able to do likewise: analyze your standing movements to help you figure out what will help? I bet they might be helpful...