In reply to jon: I'm no expert, but my dad had a hip op. He's into badminton big time. He was told he needed a hip replacement. I'm pretty sure it would be classified as a total. He decided to put off the op cos he's got a v. high tolerance to pain and probably thought he knew better. I saw him go from someone with a slight limp to someone who looked like he had curvature of the spine within a year. He had to give up his badminton. His leg muscles wasted rapidly and I imagine he had considerable muscle loss in many other postural areas. So when he finally did have the op he was in much worse physical shape and was coming from much further back in terms of post-op recovery.
I talked him into having it done, and seeked out advice and examples from people I know: A guy in the climbing club in the UK who's had both done and still climbs and walks, I can't comment on his climbing standard. A guy here in Italy who's a retired surgeon, both hips, nearly 70 and into ski-touring big time. No problem, still doing massive ascents with a heavy sack.
My (LAY) understanding is the hip type is chosen after the surgeon determines the patient's mobility expectations: an sedentary lifestyle means a hip which is more stable (so less risk of dislocation?) but offers less flexibility and a speedier recovery and maybe anticipates that the patient is going to be less disciplined with the physio (so less suitable for climbing); a more active lifestyle expectation and the new hip offers greater mobility but requires more rigorous physio to make it stable (and reduce the risk of dislocation?) and a longer recovery.
But as I say, research this 'cos I could be talking bollocks.
Anyway, my dad finally had the op, had quite a bit of pain, was walking very quickly and is back playing badminton now, and is disappointed 'cos he's no better than he was before...he also came out to Italy and crag climbed for the first time in his life