On examination, where is a Baker's cyst mass typically palpated when the knee is extended?

On examination, where is a Baker's cyst mass typically palpated when the knee is extended?

• A. Anterior aspect of the knee joint
• B. Posterior calf behind the Achilles tendon
• C. Medial popliteal fossa with the knee extended
• D. Lateral femoral condyle

Answer: (C)

Baker's cyst is a fluid-filled swelling in the back of the knee that arises from the gastrocnemio-semimembranosus bursa and often communicates with the knee joint. When the knee is extended, the cyst is most readily palpated in the medial aspect of the popliteal fossa behind the knee. This location corresponds to the natural space behind the knee where the distended bursa sits, away from the front of the joint, the area behind the Achilles, or the lateral knee region. In exam, you’ll feel a soft, fluctuant mass in that medial popliteal region, which can change with knee position or joint fluid.

Baker's cyst is a fluid-filled swelling in the back of the knee that arises from the gastrocnemio-semimembranosus bursa and often communicates with the knee joint. When the knee is extended, the cyst is most readily palpated in the medial aspect of the popliteal fossa behind the knee. This location corresponds to the natural space behind the knee where the distended bursa sits, away from the front of the joint, the area behind the Achilles, or the lateral knee region. In exam, you’ll feel a soft, fluctuant mass in that medial popliteal region, which can change with knee position or joint fluid.