At six months, I am pushing my new hip fairly hard. I am skiing hard 6 to 8 hours every day, in conditions ranging from hard pack, to powder, to chopped crud, to small moguls. If conditions are relatively smooth, I am very happy with the way the hip is performing, since I do have increased range of motion in it. It is definitely sensitive and sore with any bouncing or impact, and I am much more tentative and careful in bumps or rough snow than I have ever been before. Considering how things are continuing to improve, I am optimistic that this will go away over the next six months. If it does not improve, the final judgement will be tough for me; weighing the huge improvements in walking (pain free with no limp for the first time in over 10 years), standing (I can stand up straight for the first time in over ten years), biking (my leg no longer kicks out to the side with every spin), ROM (I can now tie my shoes without grunts and strain), etc, versus any compromise to my skiing, which is more important to me than all the rest. Since I am still seeing regular progress, I have high hopes that the compromises in skiing will go away with time.
On other "pushing it" fronts; at just prior to six months, I was jogging up mountain trails every day (not down because of impact), and that felt great. Pushing it hard on the bike felt great, unless I did not shift down enough on hills, which was just some muscle soreness.
As far as changing anything, I could not be happier with my doctor (Gross) and that whole experience. First class people, and a first rate surgery. I tried a stem cell injection therapy with a different doctor before I committed to surgery, and I do regret that. It lead to weeks of pain, and left me so crippled that I could not even swim in the pool, since any movement of my leg was excruciating. It also really hurt my first weeks of recovery, since I had been living on crutches for almost two months between the stem cell injection, and the resurfacing surgery.
Bottom line; so far, so good.
John