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Olecranon bursitis
Olecranon bursitis (also informally known as "Smiles' elbow", "elbow bump",〔Encarta ® World English Dictionary © & (P) 1998-2004 Microsoft Corporation. All rights reserved.〕 "student's elbow", "Popeye elbow", "baker's elbow" or "gamer's elbow"), is a condition characterized by pain, redness and swelling around the olecranon, caused by inflammation of the elbow's bursa. This bursa is located just over the extensor aspect of the extreme proximal end of the ulna. In common with other bursae, it is impalpable and contains only a very small amount of fluid in its normal state, and fulfills the function of facilitating the joint's movement by enabling anatomical structures to glide more easily over each other.
==Causes==
Bursitis normally develops as a result either of a single injury to the elbow (e.g., a hard blow to the tip of the elbow), or perhaps more commonly due to repeated minor injuries, such as repeated leaning on the point of the elbow on a hard surface. The chance of developing bursitis is higher if one's job or hobby involves a repetitive movement (e.g., tennis, golf, or even repetitive computer work involving leaning on one's elbow). The possibility of developing the condition is more common as one gets older.〔(NHS direct - Bursitis )〕
As a reaction to injury, the lining of the bursa becomes inflamed. It then secretes a much greater than normal amount of fluid into the closed cavity of the bursa, from where it has nowhere to go. The bursa therefore inflates, producing a swelling over the proximal end of the ulna which is usually inflamed and tender.
Another possible cause of inflammation of the bursa is infection, which can usually (but not always) be traced to a crack or other lesion in the skin which allowed for bacteria of the normal skin flora to invade deeper layers of tissue.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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