OverviewBursae are fluid-filled cavities located at tissue sites where tendons or muscles pass over bony prominences near joints, such as the knee. The function of a bursa is to facilitate movement and reduce friction between moving parts.
Update Date 9/8/2014
Updated by: C. Benjamin Ma, MD, Assistant Professor, Chief, Sports Medicine and Shoulder Service, UCSF Department of Orthopaedic Surgery, San Francisco, CA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.