About two months ago I felt a weird/stinging sensation in my knee while exercising outside. I noticed it didn't really hurt and I can still walk, bike, and do some running on it. The next day while trying to do some leg extensions I noticed it really hurt to extend my left leg. Not only that, I noticed a small piece of my outer left kneecap raise a little to the point that it is noticeable. I looked at my right kneecap and it doesn't do the same thing. While researching online, It sounded like I have a fractured kneecap. Like I mentioned earlier, there is no pain walking, jogging, biking, elliptical, or even doing a light run. Only when I extend with weights, or while sitting down with no weights. My questions is how serious is this? If I do need to get surgery how long can I wait?