I am also having issues with my right knee. It pops constantly and swells. Not to mention, it hurts when I decend stairs...Most of the pain radiates from the back of the knee. It has been bothering me for a few years and progressively get worse. My initial thought was that I had arthritis. Now, I am not so sure. I had an orthopedic surgeon who performed surgery on my elbow after an injury. I contacted his office and he's not willing to see me because I have no insurance. Now debating as to whether I should go to the emergency room. Any ideas? :-(