A Baker’s cyst, also called a popliteal cyst, is a condition where a fluid filled bulge forms around the back of your knee.

It forms when you have a tear in your meniscus. The meniscus is a special type of cartilage in the knee which functions as a shock absorber.

Baker’s cysts are commonly found in knees with arthritis.

Alternative names
  • Popliteal cyst


Diagram of the Knee looking from the side