Where is the retrocalcaneal bursa located?

The retrocalcaneal bursa is located just anterior to the Achilles tendon at its attachment on the superior aspect of the calcaneus. This bursa acts as a cushion and reduces friction between the Achilles tendon and the calcaneus during movement, aiding in the smooth gliding of the tendon as the ankle flexes and extends.

Understanding the anatomy of this area is key as the retrocalcaneal bursa can become inflamed or irritated, leading to conditions such as retrocalcaneal bursitis, particularly in athletes or individuals with increased excessive loading of the Achilles tendon.

The other locations mentioned do not accurately describe the bursa's anatomical position. The bursa is specifically situated at the back of the heel and not in other areas like the area just above the medial malleolus or underneath the plantar fascia. Thus, option B correctly identifies the retrocalcaneal bursa's location.