ok word sounds like a "medial meniscal tear". Certainly sounds a bit better than a "fucked knee".
....and don't go running.
I may get some kinda doctors opinions but as i'd basically be turning up with basiaclly no symptoms and almost no pain or discomfort they'd probbaly tell me to fuck off and not to be a hypochondriac. I'll probably see how it goes.
Just my two pence worth.