The olecranon bursa is a small fluid-filled sac that sits over the bony point of the elbow (the olecranon), providing cushioning between the skin and the bone. When this bursa becomes irritated or inflamed, it fills with fluid and produces a visible, rounded swelling at the elbow tip.
Olecranon bursitis can be:
• Non-infective (aseptic). Resulting from repeated pressure on the elbow, a single impact, or inflammation associated with conditions such as gout or rheumatoid arthritis
• Infective (septic). Caused by bacteria entering through a small break in the overlying skin. Septic bursitis requires prompt treatment