Feel for Collison, my own amateur career has effectively been ruined/ended by knee issues that are no where near as serious as his, and I appreciate the difference between someone in professional shape and myself (although I wasn't some piss head sunday footballer, was playing or training 5 times a week prior to this) I dislocated my knee and had complications with the rehab where as he has had numerous cartilage operations. I appreciate people come back, but it's not the same, it effects every decision you make, your style of play, how much you want to train, how much you are willing to run in matches. And what was worse for me, was the alarming occurrence of other injuries. My physio said it's very common even for pro's to experience what I did, having always been injury free, I started getting strains, pulls and issues due to the fact my knee was working differently and I was playing differently.
He was let go in December, must surely have trained with someone since then?