For me, it is my foot. Out of the clear blue sky with no obvious cause, pain and nerve stuff in the ball of my right foot. After months of little improvement regardless of what I did (different shoes, pads, orthotics, ibuprofen regiment, etc), I finally went to a podiatrist for the first time in my life. He called it "metatarsalgia" which isn't very descriptive. In latin, it just means "foot bone pain"! Anyway, he helped me discover diclofenac, and that is some great stuff (easy, cheap, safe, no prescription). Did nothing for several days and then suddenly- wow. He said it could take 10 weeks to heal. Unfortunately, 16 weeks later, if I stop the diclofenac, the pain returns to being exactly the same. Sigh.
Then my right shoulder started with constant pain for months. And I developed eczema on my face for the first time in my life. Getting older sucks in so many ways! I guess the alternative isn't that attractive, though.
Anyway, no problems with hips or knees yet (knock on wood), but they really have made a lot of improvements over the years in the procedure. For many people, it is just amazing how quickly they can heal from the surgery and be almost normal again. Jim will do great!!!!