What all have you tried?
I like coming down the saphenous nerve distribution sometime with multiple needles in the “box” if you will. Adding ENS for added central effects in this distribution can be great in chronic OA conditions.
I also find if I can get the pain to clear with tibial Internal rotation MWM posterior knee, lateral and medial popliteal, common fibular, and near popliteus have worked well.
Let us know how it goes.