I was told by new orthopedic doctor about a year ago that he thought it was stem tip pain. So that was about 19 months post surgery. He suggested a bone growth stimulator as a possible help. I used it faithfully for about 6 months (3 hours per day) and thought I was feeling improvement but that was short-lived and I stopped.
What's funny is that I have multiple friends who all said it was the best decision they ever made and I regret having it done or at least having the older style implant which has a longer stem. But at the time I didn't know there were different types of replacements.

I am starting to realize that although surgery is a success, there are things that happen post surgery that present problems later on. For instance, 9 months after a very successful surgery I was at a local park, more like a tourist attraction, when a dog (off leash) rammed head first into the thigh on my operated leg. Then same dog came back around and did it again. There is a sign at the entrance to the park that states dogs have to be on leash. The locals don't care. I was in pain and a bit later was walking down the block to see my daughter when I started to collapse. Long story short, up until that time I had been almost pain free. Anyway, 6 months later I had a follow-up with my surgeon. The x-rays looked fine so I did not mention the incident with the dog. I had been SO good at not falling and doing exactly what I was supposed to do and some entitled person decides that her dog can be off leash whenever she feels like it. It's infuriating. I have not been back to that park in over a year and a half. My point is that we have no control over everything.