Why a revision???

I don't understand. I was just reading a question below about an open RNY in 1996 or something and now it has to be revised? Why is that? I thought that they open rny was one of the most popular surgeries? Why would someone have to have it revised and what type of revision? I am concerned because I do not want to go through surgery again if I can avoid it. Also, why would someone have one type of procedure if they know that it would have to be revised in the future? Thanks

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