At 57 --- even if you had a revision in the next 10 -15 years. You would still outlast your second knee most likely. 30 to 47 -- you may want to rethink the ruff and tuff piviot sports. I mean could you.. get to that point where you would think .. hey I can run jump and play.. Sure.. but one bad move .. and something happens. would the OS being able to get you back to the spot you had be in ? Most likely no.. revisions appear to reduce your mobiltiy and from what I have seen on folks who had multiple revisions they get extra special issues as well.. like RSD.. So while getting out to play a game is a great goal. I wouldnt want you to have your life suck with pain management appointments post revsion.. Something to think about before going rambo.. Btw it would be a year or so before you feel normal enough to even want to think of baseball volleyball and what not.