The swelling is from the site they took the plugs from on his knee. The doc drained the fluid with a needle and he is doing better. The doc said he does not know why it happened but to watch it and if it continues the next step is an MRI, which in my mind, is the most worthless tool ever! Our magnet is so small compared to big city ones. Our hospital has a truck that has the MRI Magnet on it. Just plain stupid. If you want quality care don't live in Wisconsin !