We all have a small amount of fluid in our joints. It’s our personal joint lubrication system that cuts down on friction and helps to promote smooth joint.
Joint effusion happens when too much fluid accumulates around a joint. When it happens in the knee, it’s commonly referred to as swollen knee or water on the knee.
It can be the result of injury, infection, or a medical condition.
To learn more you should go to a medical professional.
Keyword: water knee