A burse is a fluid filled sac that decreases friction between two tissues. In its normal state it has very little fluid. When it is irritated the burse fills with fluid and becomes painful. A burse can also protect boney structures or prominences. There are several bursae at the elbow. The olecranon burse is the most commonly irritated.
Common conditions affecting the burse include
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Elbow Bursitis
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Olecranon Bursitis