A member asked:

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

11 doctors weighed in across 2 answers
Dr. Sourendra Raut answered

Specializes in Orthopedic Foot and Ankle Surgery

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.

Answered 6/10/2014

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Dr. Mark Galland answered

Specializes in Orthopedic Surgery

Knee MRI: Effusion is "water on the knee". This could be benign or caused by an internal derangement (ie: cartilage tear).

Answered 6/18/2016

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