There is more to the reported failures than meets the eys. IMHO, this is not for every patient. Nice to want a bone sparirng procedure but the technical challenges remain for this procedure. I have no idea why patients with AVN, cysts, obesity, etc. would have this procedure done. It was never indicated for everyone. This risks are just multiplied when these are factored into the equation. Even uncemented HR is an added risk. Females.... hummm. All the long-term data is on cemented HR.
One factor that will help us all is that it seems that there is a chance for a US registry. It would be nice if all surgeons had to comply and we could see by surgeon his/her success / failure rates.
Perhaps a bit of venting here. I am 5 months post op with great results as I have reported. I am a huge fam of HR. I guess that I think people should really think about this procedure relative to the factors that increase the liklihood of a successful outcome, including the gold standard total hip.
Best wishes..