The structure indicated is the prepatellar bursa
of the knee joint.
The synovial membrane
of the knee joint forms bursae to protect the structures of the knee joint and to provide low friction surfaces to allow tendons and structures of the knee joint to glide smoothly over one another. In addition there are several other bursae which do not communicate with the joint cavity, located in and around the knee joint. The prepatellar bursa
is found anteriorly, and as the name suggests, in front of the patella. There are several other bursae located laterally and medially. Anterior bursae
- Suprapatellar bursa
- Prepatellar bursa
- Infrapatellar bursa (superficial and deep bursae)
- Pretibial bursa
The prepatellar bursa can become inflamed, causing swelling and pain above the kneecap. Prepatellar bursitis
also known as housemaid’s knee
, as it is commonly found in people who frequently kneel, causing pressure and friction on the prepatellar bursa.
Learn more about the anatomy of the knee joint in this anatomy tutorial Explore the knee joint
with our 3D anatomy atlas