An appointment with your surgeon is a good idea. We have no way to assess all the possibilities - yes it might be soft tissue, yes it might be nerve, yes it could be orthopedic.
If after seeing him you're not satisfied with his work up and plan, you could consider a second opinion.
If you do, we suggest you seek that second opinion surgeon from a practice and a medical center completely independent from your original surgeon. This isn't because we think anything went wrong in surgery! The problem we have seen is a lot of orthopedic surgeons tend to look at the x-ray, tell us we're actually fine, and that's that.
Second, we suggest the second opinion be from a surgeon who specializes in knee replacement revision. This isn't because we think you need more surgery! It's because these are the surgeons who see lots and lots of "problem cases" and are better able to diagnose your knee problem.