Tennis elbow pathophysiology

Tennis elbow Microchapters

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

## Pathophysiology[edit | edit source]

Term "lateral epicondylitis" is a misnomer because, pathologically, this condition consists of mucoid degeneration with a paucity of acute or chronic inflammatory cells.

With tennis elbow, extensor carpi radialis brevis tendon of the extensor carpi radialis brevis muscle has been identified as the primary site of pathological change. There have also been pathological changes found at the extensor digitorum communis, longus and ulnaris tendons. The extensor carpi radialis brevis has a small origin and does transmit large forces through its tendon during repetitive grasping. It has also been implicated as being vulnerable during shearing stresses during all movements of the forearm.

There is no evidence relating mode of onset to pathology although it is generally acknowledged that tennis elbow is caused by repetitive microtrauma/overuse.

Inflammatory changes have been noted in the acute stages of the condition but have been found to be absent if symptoms become chronic (3 months +). This may explain why approaches such as corticosteroid injections have little impact in the chronic stages of the condition.

Although the name suggests otherwise tennis elbow can affect anyone not just racquet sport players although there are numerous studies that have implicated racquet sports as a cause or contributing factor for tennis elbow. The peak incidence is between 34 to 54 years of age. No difference in incidence between men and women or association between tennis elbow and the dominant hand has been demonstrated. A weak association has been found between work and tennis elbow development.

## References[edit | edit source]

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