I had TPF surgery 4 months ago. And I have really annoying pain on the inside of my knee when I put weight on the leg. I assume your surgery, like mine, was on the other side? I’m sure my pain is nerve related because all it takes to induce pain is to touch the area lightly with my fingers. I had to convince myself that this pain was not important, and to just try to ignore it. With continued exercise I find that the pain is getting less intense. But with any pain, don’t hesitate to ask your OS about it. It could be a simple thing that he can remedy easily.