Baker's Cyst

A Baker cyst is a fluid-filled growth that develops behind the knee. It causes a bulge and a tight feeling. A Baker cyst, also known as a popliteal cyst, can cause pain. When engaging in physical activity or fully straightening or bending the knee, the pain may worsen.

Causes and Risk Factors

Synovial fluid, a lubricant, aids in the smooth movement of the leg and reduces friction between the moving parts of the knee.

However, underlying conditions can sometimes cause the knee to produce an excessive amount of synovial fluid. When this occurs, fluid can accumulate in the back of the knee, resulting in a Baker’s Cyst.

This could be due to:

  • Knee joint inflammation, which can occur with various types of arthritis.
  • A knee injury, such as a cartilage tear.