First, no chromium or cobalt levels are completely safe, and the longer you wait, the more soft tissue damage there is. I waited too long and ended up with heart and thyroid issues from the metals.
Second, revisions are about the same as the original surgery or easier if they just replace cup liner and femoral ball, and not the stem and cup.
Third, the phone is your friend. Call ortho practices and ask specifically whether they do Stryker revisions. When you first see the doc ask them how many and complication rate.
Finally, get your metal ion numbers and keep track of them, keep checking after surgery to make sure they go down. .
Good luck, and ask me anytime.
Sue