It is a superficial bursa with a thin synovial lining located between the skin and the patella.

It is common in people who frequently kneel, such as roofers, plumbers, carpet layers, and gardeners.

It is also common in wrestlers due to the repeated impact on the knee when shooting.

Physical exam reveals erythema, tenderness to touch, fluctuant edema over the lower pole of the patella and crepitus.

For patients with high athletic or occupational demands, intrabursal steroid injection may be performed.