Water on the knee refers to excess fluid inside the knee joint cavity (effusion).

Synonyms: 
Effusion
Bursitis
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A simple explanation of the term 'water on the knee'.

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CLINICAL PUBLICATIONS

Joint effusion of the knee: potentialities and limitations of ultrasonography. Draghi F, Urciuoli L, Alessandrino F, Corti R, Scudeller L and Grassi R. J Ultrasound. 2015 Sep 18;18(4):361-71. doi: 10.1007/s40477-015-0180-3. eCollection 2015 Dec.


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