Baker's Cyst

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Baker's Cyst

Fracture Care

A baker's cyst is a benign swelling found behind the knee.

A baker's cyst is also known as a popliteal cyst which lies posterior to the medial femoral condyle. The cyst is connected to the knee through a valvular opening. Knee effusion from intra-articular pathology allows the fluid to go through the valve to the cyst in one direction.

  • The patient usually has swelling behind the knee with pain, fullness, and tenderness.
  • Baker's cyst is easier to see with knee fully extended.
  • The diagnosis is confirmed by MRI, an ultrasound can also be helpful
  • These tests are important especially if the cyst is found to be outside of its typical position.


There are two most common causes:-

  • Knee arthritis
  • Meniscal tear