prepatellar bursa

The prepatellar bursa is a synovial sac located in front of the kneecap. It acts as a cushion between the skin and the patella (kneecap). Inflammation of this bursa is called prepatellar bursitis, often referred to as "housemaid's knee".12

Bursitis, in general, is the inflammation of a bursa, which are lubricating sacs found around joints or between tendons, muscles, and bones. Causes can include infection, injury, arthritis, gout, calcium deposits, or repetitive minor irritation. Jobs or hobbies involving repetitive movements or pressure on a bursa, such as kneeling, can increase the risk.3

While the prepatellar bursa is specifically located at the knee, bursitis can affect other areas like the shoulder, elbow, and ankle. Treatment typically involves rest, heat, exercise, and sometimes medication or injections.3