The knee is the largest joint in the body (and one of the most complex), meaning it's also one of the most problem-prone. While knee strengthening exercises can help keep the joint in tip-top shape, if you find yourself with a swollen knee you'll want to ...

Add Yahoo as a preferred source to see more of our stories on Google. Photo credit: Peter Dazeley - Getty Images "Hearst Magazines and Yahoo may earn commission or revenue on some items through the links below." About 16% of people worldwide have knee ...

If your knee is swollen, it's also called a knee effusion. Swelling happens when fluid builds up in the knee joint. Sometimes a knee effusion is referred to as “water on the knee,” but that is not a valid description because fluid in the knee is not water.

A swollen knee can be caused when your knee is hit and the thin sac around the kneecap, known as the bursa, swells. Tiffany Raymond Q. Last week, I was working in the yard and banged my left knee hard on the ground. It hurt for a few minutes and then the ...