edro- go get it checked. It might be your ACL. I didn't even notice my injury until the kneecap filled up with liquid. But leading up to it I always had the feeling like I wanted my knee to pop (like when you crack your knuckles?). The doc said that is because your kneecap is shifting and floating in all that liquid building up. The best thing is not to bend your knee. Give it a rest for about 2 weeks and see how it feels.
Also, I used to do like you and run stairs a lot and squats. At one point I was doing 500 squats (no wieght) a day. I recently read somewhere that you shouldn't do more than 200 or 250.
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The noble soul has reverence for itself
-Neitzsche
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