Why am I walking funny?

I had an arthroscopy on my right knee a few months ago. Not a huge operation, but they do anesthasise you for it, leaving you fully knocked out. For some reason my surgeon felt it was necessary to give me a set of pictures of the inside of my knee (I hope that's what the pictures are of). It would explain why I walked a bit funny after, should it be what it looks like it is. Which is of course a knee operation. That's all it looks like.