A member asked:

What causes a persistant cyst that comes out from the side of my knee replacement it was surgically removed and a poly exchange and it's back again?

4 doctors weighed in across 2 answers

Fluid collection: Cysts are typically comprised of joint fluid that escapes the joint through a communication between the joint and the subcutaneous space. The questions is whether there is still a cause for persistent fluid collections. Probably, entities such as infection, instability, loosening should be ruled out. You should talk to your surgeon.

Answered 10/15/2013

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Possible infection: I would worry about an infection in the knee replacement. Need fluid from knee analyzed as well as bloodwork.

Answered 10/4/2016

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