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About.com Health's Disease and Condition content is reviewed by Kate Grossman, MD

Definition: Tennis elbow is an overuse or repetitive stress injury of the extensor tendons in the forearm. This results in muscle injury and tendon inflammation/degeneration. When this occurs a painful sensation is experienced on the outside portion of the elbow, the location where the extensor tendons insert.

Pronunciation: lateral e-pi-con-dy-li-tis

Also Known As: Lateral Epicondylitis