I went to the ER with extreme swelling in my knee and a lump on the side of my knee the size of a golf ball. I told , after x-rays were taken, that I had several pieces of cartilage floating around in my knee joint. I have to see an orthopedic surgeon . However, I have not seen him yet. Now, 6 days later, my entire leg is swollen, especially my ankle. My ankle is swollen to twice the size of my knee. Why is my ankle swollen like this when the problem is related to my knee?