What is bursitis?

Updated: Dec 11, 2020
  • Author: Kristine M Lohr, MD, MS; Chief Editor: Herbert S Diamond, MD  more...
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Answer

Bursitis is defined as inflammation of a bursa. Humans have approximately 160 bursae. These are saclike structures between skin and bone or between tendons, ligaments, and bone. The bursae are lined by synovial tissue, which produces fluid that lubricates and reduces friction between these structures.


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