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A 44-year-old male asked:

I have swelling in the back and side of my knee?

1 doctor answer1 doctor weighed in
Dr. Frederick Buechel, jr. md
Orthopedic Surgery 26 years experience
Commonly a cyst: This can be from many things but if you have an internal knee problem like a meniscus tear or wear on your cartilage, you joint can make extra fluid and this can escape out the back of the knee joint and create a space filled with joint fluid called a poplital (or baker's) cyst. Get evaluated by your doctor first and get a diagnosis.

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A 39-year-old member asked:

Swelling in the back of the knee, hurts some; how do you know if it isn't a clot?

1 doctor answer2 doctors weighed in
Dr. J.Milo Sewards
Orthopedic Surgery 21 years experience
Venous ultrasound: A mildly painful swelling in the back of the knee can be a cyst coming off of the joint (a baker's or popliteal cyst). If you have other risk factors for a blood clot (smoking, history of cancer, family history of blood clots or a tendency to clot), then a venous ultrasound may be the best way to try to differentiate the two. Often a diagnosis of a popliteal cyst is made by location & size.

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Last updated Feb 24, 2018

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