I have been sidelined from running for a while due to knee surgery and am getting back into it slowly. I did a run today and about minutes 15-20 I started having pain below my knee but above my shin. As I continued to run, the pain intensified. When I tried applying pressure directly below the knee, it was very tender. It is also tender on the inner side on my knee. Is this some sort of shin splint? IT band syndrome? I am dumbfounded.