Jyoti, now that you tell us more about your condition, I can add a little more.
First, having had osteotomies in the past does indeed make for complex hip replacements. But it's not something we're not accustomed to. There are surgeons with plenty of experience in dealing with these situations.
Second, the condition of your muscles is a very important factor. If you've had reduced mobility for years, then the muscles will be underdeveloped and lack tone and that will effect the outcome of the THR. The question is, will those muscles ever regain their bulk, strength and tone after being that way for so long? They might, they might not - only time will tell. I think that was why he was so non-committal. And the same will apply to the leg length discrepancy. He can only do what he can and he'll only know what that is when he gets in there, as he said. I think it's quite right for surgeons to be wary of offering bright and overly positive opinions about these kinds of situations as no-one can really predict the overall outcome.
Thirdly, about the longevity of the implants. They will last a long time, for sure, but if you have all these musculo-skeletal problems, the stresses could effect the seating and fixation of the implants. Meaning that there could be an increased risk of loosening or implant fracture. But I'm guessing it won't be a great increase. Remember, there are many in your situation who have had such problem hips converted to THR and though the revision rate is a little higher, it still means there are lots out there who are managing very well.
The end result is, the only thing for certain is that you will be free of bone pain. Whether you will be free of soft tissue pain, regain a significant amount of movement or whether the implanted joint will last you years and years, no-one can really say. But I can say that with the right surgeon, the odds will be very much in your favour.
So you need to be down-to-earth practical about this and prioritise your expectations. Make a list of the things that are bothering you and grade them as to what you'd settle for on a scale of 1-10. They could include
- getting rid of the bone-on-bone pain
- movement as in walking better, getting up off chairs more easily
- being able to stand for periods
- being able to walk distances
- being able to sleep better
- not having to take daily pain killers to get through your day
- being able to sit on the floor
- being able to put on sock and tie your shoes laces
So if you rated the bone-on-bone pain as being the predominant thing, then you need to accept that you'd be prepared to go on with the rest and so on. Once you've got that sorted, and had the hip done, then every other item on your list that you got back would be a bonus. See what I mean?
It doesn't mean that you won't get them nor that it mightn't be a struggle to get them back, but at least you'll start with realistic expectations and not be so disappointed when you get this kind of reaction from the surgeons. Because really that's like asking them to see into the future and none of them are that gifted!
Anyway, tell me who were the surgeons you saw and at which hospitals and I'll take a look at their bios and I'll see if I can't recommend someone who has a bit more experience in your kind of case.