This bursa has a thin synovial lining. Normally, it does not communicate with the joint space and contains a minimal amount of fluid. Inflammation of the prepatellar bursa results in marked increase in fluid within its space. This bursa is superficial, suggesting that it is undeveloped at birth. Within the first few months to years of life, the bursa arises from direct pressure and friction.
Morbidity usually is secondary to pain and limited function.
In the case of septic prepatellar bursitis, failure to diagnose in a timely manner may lead to increased morbidity secondary to infectious etiology. Incidence is greater in males than females. Aspiration of prepatellar bursa fluid may be indicated because sepsis is common. Consider injection of the prepatellar bursa with corticosteroids only when infection has been ruled out. Select position of maximal fullness as the site for injection.