I don't think there is any set schedule for replacement of joint replacements (aka revisions). It depends on your activity level, what material the current prosthetic is made from and how much pain/debility you are willing to live with once the replaced joint starts to wear out.
You posted your question in a community of people diagnosed with or focused on the disease of multiple sclerosis. This is a neurologic disease. You have an orthopedic concern. I have requested that the moderators take a look at your question. If necessary, they can move it to a place where it will be seen by people who are better able to answer.
Mary
Hi
you have reached an MS patient run forum, so not sure about your question.
revision of what?