I am a 53 year old physically active male who has had three acl replacements (all allografts) within a one year time frame, the most recent about one year ago. My most recent replacement was "eaten away" by two different types of staff infection, most likely contracted at the time of the third replacement only 10 days earlier. I am trying to determine what I can do, other than exercise, to compensate for not having an acl in my right knee and would like to know where can I find statistics on the success rates of fourth acl replacements in men of my age? Also, where can I go to determine what, if any, altermative procedures can be performed to enable me to function normally in terms of athletics and every day life?