I slipped on the stairs and fell on my right leg and knee. I did not hear anything pop but the inside of my knee is sore. My knee and leg is very slight swollen. My foot also may swell very slightly. I am walking but with a limp. I feel the effects of the trauma when I get into the car or sit for long periods of time. I am not in a lot of pain but it is uncomfortable. It has been four days and when I wake my leg is kinda stiff. I have been wrapping my leg but the sypmtoms are still there. Does this sound like something major?