Just to answer some of the questions posed, I have pasted an image that explains nerve pathways. The ones I have damaged are S1-S4. Background story here, for anyone interested:
http://mysynovorevison.blogspot.ca/2015/01/january-14-back-in-vancouver.html.
This means certain muscles are weak, and large parts of my left leg are entirely numb. This IS affecting the stability of that joint, and I can only work out so much between all these surgeries to affect any real change. Spine is fused from S1 to L1.
Dr. Pritchett has been quite helpful in suggesting I might want to just stick with this joint for now and wear a Hip Abductor Orthosis - a type of brace I have read about, which is not cheap and not pretty. I have been asked to wear this for 3 or 4 months all the time, except when I shower.
Although some of the newer THR's offer less likelihood of dislocation, the HR was supposed to be the best solution for this and I managed to dislocate that twice, so I am in no rush to lop off my femur head.
I am kind of breaking new ground here, and there is not a lot to fall back on in the way of comparisons. hence I am reaching out to try to find someone with anything comparable to get a sense of where I am headed. Pritchett has told me that I will likely have to avoid any extreme range of motion for life. That kind of sucks, having enjoyed rock-climbing for most of my life.
It sounds like I just have to hope this will work, and there is nothing that can be done to hold that combo unit in place as well as the right one has worked out....other than strength training in that leg. Too much though, and that can apparently set off nerve pain (from the back injury) which require heavy meds. It can also leave the leg weak...and potentially unstable.
Anyway, it's a bit of a pickle I am in, so anyone with some helpful leads on this will be most appreciated.