Inflammation of the bursar (fluid-filled sac) that lies underneath the patella (kneecap) and over the top of the tibia (shin bone) acting as a cushion against friction. The condition is often the result of extensive kneeling in an upright position (this is why it is sometimes known as Clergyman’s knee). Infrapatellar bursitis is comparable to prepatellar bursitis, or Housemaid’s knee; however, this other condition usually arises from prolonged kneeling while leaning forwards, which creates excessive pressure on the bursar that sits in front of the kneecap.
Infrapatellar bursitis creates pain and swelling. Knee movement can also be restricted. The swelling often goes down with rest; nonsteroidal anti-inflamatory drugs can help to alleviate the discomfort. For constant symptoms, a doctor can drain the fluid from the bursar and insert a corticosteroid drug into the sac. Constant changes in position and use of foam padding is advised.