I'm almost 23 and my knee issues began at age 14. When I was 14, I was diagnosed with Osgood Schlatter disease in both knees. I have had pain in my knees ever since, which is now tendonitis (considering Osgood Schlatter, by its own definitions is a growth related issue, adults can't have it). Most of the time, I just deal with the pain, it's not debilitating, just more of an inconvenience and causes discomfort. I feel some fluid in each knee. Sometimes, my knees pop slightly--but it doesn't feel better or worse afterwards.
On December 30, as I was getting up from a chair, I heard a loud popping noise in my left knee. I sat back down and tried to bend and straighten my leg. I could bend my leg back with no problem. But I couldn't fully straighten my leg out. I was able to get my leg about halfway straightened before I couldn't move it anymore. As I tried to extend my leg straight out, I felt a sharp, stabbing pain on the lateral side of my knee, kind of on the side of my knee cap. The pain was more intense than anything I felt in a long time. The pain didn't go away when I rested. In all my years of knee troubles, I have never experienced or felt anything like that before.
I tried that bending and partial straightening a few times before I eventually got up. When I stood up and put weight on my left leg, I felt some pressure on the knee. It didn't feel good but I didn't have to limp very long. I noticed the knee was swollen.
The next day, the pain has subsided some, but the swelling is still there. I'm wondering if anyone has had something like this happen to them and their experience with it. I'm wondering if it's an injury or just some random episode.