Some questions today in the nytimes
http://www.nytimes.com/2011/08/23/business/complaints-soar-on-hip-implants-as-dangers-are-studied.html?_r=1&partner=rss&emc=rss
I believe the article refers to hip replacement, not hip resurfacing, yet of the same problems might exist. Perhaps some patients are allergic to the metals? Maybe they should use 24 k gold, might double the price!
Anyway, read the comments attached to the article they are useful as well.