A bursa is a small, fluid-filled sac, similar to a slippery water balloon, located at places in the body that are subject to excessive friction. When a bursa becomes inflamed or irritated, it responds with more fluid, resulting in pain due to increased pressure on the surrounding tissue.

Anatomy

The olecranon bursa resides at the elbow joint between the skin and the olecranon process of the ulna. Its function is to reduce friction between the skin and the olecranon process when the elbow is placed through a range of motion, ...

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