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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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How old are you? (rhet) but that's a Q. Over the years, Hip and knee replacements make tiny wear particles, which the body tries to 'eat' but cant, so the attachment area gets 'eaten' instead. Which will loosen many designs from the bone. And then they do a so-called 'revision' to fix that for maybe another 10-15 yrs. After that... 2nd revisions are harder to come by. -Hips wear less, as the knee joint has both rolling and sliding elements.
That's my (dated) 2cents worth.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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