I'll occasionally get shooting knee pain when my legs are spent after really tough work outs. For example, I had an 8 hour adventure race today and have been gingerly walking around on sore legs. I just sat down and felt shooting pain just under my knee cap and slightly to the inside. It only lasted a split second. I've torn my MCL a while ago but it seems like I get the pain every once in a while on either side. Should I be concerned about the ligaments or anything else or is this somewhat typical after overuse?