os trigonum

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A small bone behind the ankle. It is present in only about 7% of the population. The bone develops as an extension of the ankle bone and then becomes detached. It usually causes no problems except during certain activities, such as repeated, energetic bounding movements, commonly performed by gymnasts, basketball players, and jumpers. The bone may become squeezed between the ankle bone and the shin bone, causing pain and damaging surrounding tissue. Surgical removal may then be necessary.

os trigonum

Subjects: Sports and Exercise Medicine.

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