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A 48-year-old female asked:

i took a mri for my knees and they said i have something. like a small joint effusion. what dose that mean?

2 doctor answers10 doctors weighed in
Dr. Sourendra Raut
Orthopedic Foot and Ankle Surgery 18 years experience
Swelling: An effusion is a medical term for swelling. The MRI is a sensitive tool that picks up even the slightest abnormality in a given area. A small effusion is a small amount of swelling in the joint. This could be due to a number of things, from arthritis to ligament and cartilage injury.
Dr. Philip Chao
Dr. Philip Chao commented
Radiology 38 years experience
but it really means water in the joint
May 13, 2013
Dr. Mark Galland
Orthopedic Surgery 32 years experience
Knee MRI: Effusion is "water on the knee". This could be benign or caused by an internal derangement (ie: cartilage tear).

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Last updated Jun 18, 2016

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