Busylizzie,
Good luck in the morning.
Want to make sure I have this right. When your foot is straight your pain is less, but you cannot bend your knee. When your foot is to the side, you have more pain, but you can bend your knee.
Right now it is very easy for your foot to go from straight, to the side and back?
Wearing the brace helps, but you need a sturdier brace than before, to keep your leg in a comfortable position.
I hope you get the correct imaging to determine what is going on with your Revision.
IMO, they should image you knee in both positions, since you can move it at will..