Definition
Bursitis is inflammation of the fluid-filled sac (bursa) that lies between a tendon and skin, or between a tendon and bone. The condition may be acute or chronic.
Overview, Causes, & Risk Factors
Bursae are fluid-filled cavities near joints where tendons or muscles pass over bony projections. They assist movement and reduce friction between moving parts.
Bursitis can be caused by chronic overuse, trauma, rheumatoid arthritis, gout, or infection. Sometimes the cause cannot be determined. Bursitis commonly occurs in the shoulder, knee, elbow, and hip. Other areas that may be affected include the Achilles tendon and the foot.
Chronic inflammation can occur with repeated injuries or attacks of bursitis.
Pictures & Images
Bursa of the elbow
Bursae are fluid-filled cavities located at tissue sites where tendons or muscles pass over bony prominences near joints, such as the elbow. The function of a bursa is to facilitate movement and reduce friction between moving parts.
Bursa of the knee
Bursae 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.
Bursitis of the shoulder
Bursae are fluid-filled cavities located at tissue sites where tendons or muscles pass over bony prominences near joints. Their function is to facilitate movement and reduce friction between moving parts. When a bursa becomes infected, traumatized, or injured it is referred to as bursitis.
Review Date : 8/11/2008
Reviewed By : Linda Vorvick, MD, Seattle Site Coordinator, Lecturer, Pathophysiology, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
