Chuckm: I am wondering if you are suggesting something I might be missing. I have been told I have an unstable hip joint and neuropathy that is affecting the integrity of the joint.
Roboclimber, it could be that you are missing some or part of the hip capsule. Much like a knee missing the ACL ligament. But if it was that way at the time of surgery I think Dr. Pritchett would have put you on a very cautious recovery plan knowing that the dislocation risk was greater for you. I think this was unforeseeable.
But, considering the nerve damage you mention, it could be possible that you do not feel pain in the capsular tissue. Normally you feel very sharp pain before the hip dislocates. You would have an uncontrollable reflex that would stop you immediately from continuing the movement that you were making. Or, perhaps you did feel that extreme pain before the hip went out, but you had already gotten yourself into a situation that you couldn't reverse yourself despite the pain.
Regardless, once the capsule is compromised, it may not tighten back up. If it is popping out just rolling over in bed, there is definitely an issue with those ligaments not doing the job of holding the hip tight to the pelvis.
A total hip replacement is even worse for dislocation.
But the dual-motion hip replacement is unique. It is the total hip replacement device that does not dislocate because of the way it is designed. And it looks like that device is doing extremely well for low wear rates and durability.
It sucks to have yet another surgery, however, Dr. Pritchett does have a point that the dual-motion will be a good option for your situation.
Chuckm