A leading orthopedic surgeon who did not want to be identified says that fluid in the back of the knee is commonly referred to as a baker’s cyst, and that it is rarely a condition you find in a patient “with a 100% normal knee.
“It means there is something going on with the knee,” the doctor added. “The question is, where did the fluid come from? What is the source of the fluid? Something inside the knee produces that fluid, so what is going to stop the fluid from coming back.”