Hello, all the comments above are spot on - I will ask tho' what is the scarcest/ worst thing that worry's you? Then write it down and put in god s hands. Chances are those worries will never happen. I have had over 10 surgery's at Mayo Rochester. My surgery is on Dec 15 with Dr Trousdale. I trust Mayo's to do their dammest and so far it is working - My revision is to replace the poly liner in a 29 year old hip . hugs