I can identify with you tebop.   Knee injuries are horrid.   What did you do to your knee?  Did they give you brace? Wearing one of those is a PITA. It never stays where it should. 
Did you happen to find the kneegeeks forum in your search?  Some very scary stories there but also lots of help & support.. 

And from what I've read, water aerobics are very good therapy for knees tho' don't do it without your OS's consent.. 
I've been there/ done that so if  you need someone to talk/cry/complain too..  Site mail me.. 

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Life may not be the party we hoped for but while we're here we should dance.