From Jonathan Cluett, M.D.,
Your Guide to Orthopedics.
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About.com Health's Disease and Condition content is reviewed by Kate Grossman, MD

Definition: A hammer toe occurs when the middle of the toe points upwards abnormally. This most often occurs in the second toe, and is often the result of a big toe bunion pushing on the second toe. A painful callous often forms on to on the first joint in the toe.

For more information: Hammer Toe