So sorry I took a while to get back to you. I myself am in the role of care giver to my wife who just had a full hip replacement. So in answer to what you heard I never was told that. Ive met quite a few people who have received them both on here and in person. But I can't say enough about the expertise of the Mayo doctors. But like any major surgery there are always chances of unforeseen problems during and after. For me personally I was pretty sick and I in my own thoughts knew if I (and i stress for myself only) was facing death without one. So with my faith I was ready for what ever happen. Each person needs to decide that for themselves.
As for the percentage this website has lots of data on that. I thing the figure you read was a bit high. Just glancing thru the web site I saw figures from 5-10 % and under lots of different reasons. Here is the site
https://www.srtr.org/
Hopefully this helps in making your decision. That site also should some of the most successful Transplant Hospitals so that may hepl in you decision also. When I got mine the survival rate was between 92-95 % but that was 6 years ago and it may have changed since then.