Bursitis is inflammation of a bursa, a lubricated pouch or sac in regions where there is a lot of movement between muscles and bone.
Common types of bursitis
Most cases of bursitis are of the non-infeted type, and resolve on their own. The most common bursitis in the knee is pre-patellar bursitis, often seen in someone who has done uncommon exercise while kneeling, such as scrubbing a floor or fitting floor tiles. If there is any penetration of the bursa then it may become infected. Pes anserine bursitis may ocur in breaststroke swimmers.
Synonyms:
water on the knee
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CLINICAL PUBLICATIONS
Endoscopic treatment of prepatellar bursitis. Huang Y-C and Yeh W-L. Int Orthop. 2011 Mar; 35(3): 355–358.
Management and outcome of infective prepatellar bursitis. Wilson-MacDonald J. Postgrad Med J. 1987 Oct; 63(744): 851–853.