Hi Christine!
Interesting case for sure. Have you tried needling the quads? Maybe L3/ L4 spinal segment? Primary passive trigger points for the LE for sure (not sure if you know those from Foundations? But the IT band, common peroneal, deep peroneal, saphonous, tibial.
Check out the Dunning paper from 2018. Even though he is not an OA patient, may give you an idea. I would try this and see if it is helpful from a pain standpoint.
Just some thoughts. Keep me posted!