7 years since right hip replacement. Running 25 to 30 miles a week since then (3 to five times a week). Run on mixed surfaces (concrete, crushed gravel, dirt trails and asphalt). I’m most cautious running downhill. Also, I don’t do any speed work. A lot of down hills and speed work usually results in hip soreness for a couple days. However, I’m pretty tall and not the lightest person (6’3/195 lbs) so I guess that makes sense for the pain. Other than that, hip is great. I think most of us figures out what our hips will allow us to do.