What are the treatments for "water on the knee"?

Doctors may put a needle inside the knee joint or into the bursa sac in front of and below the kneecap to find where the fluid is coming from. The needle can then be used to draw the fluid out. However, if the problem that is causing the extra fluid is not corrected, the fluid will probably come back. Unless there is an infection in the knee, there is no danger in leaving the fluid there because the body will gradually absorb it.

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