Good luck with it all, too much football and a rather nasty injury eventualy resulted in a total knee replacement for me (35 years later).
I have no doubt that had todays technology been avalable when I was first injured I would still be standing on my own knee.
For those who are wondering the TKR works very well but is subject to all sorts of trouble with the self important numptys in security, most of the security staff have no problem with it but once in a while I am subjected to what I can only describe as an assult by one of them, you just have to put it down to a power trip by one of lifes failures.