The first was a "uni" knee and the next 2 were total knee revisions. Both of the total revisions failed within a year of their replacements. All 3 were done by different surgeons, different hospitals, and the last being done @ Mayo in Minnesota. Knee aspirations show no infection. I am now faced with the FOURTH failure as X-RAYS show the knee is separating from the bone. I am at a loss as to what to do. I have NO HOPE for a 4th replacement working!