I know all cases are different, but someone in my yoga class has had knee replacements and says the yoga has gotten her a lot farther than her doctor thought she'd get. Some positions she still can't reach, but she makes the attempt. So when you're done with the PT consider keeping up with yoga.
Ugh, Graston technique ... I had that done for my hamstring, often quite painful but I couldn't deny the positive effect. Glad it's helping you.