Fabella

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The fabella (Latin for little bean) (see also: Flabella) is a small sesamoid bone found in some mammals embedded in the tendon of the lateral head of the gastrocnemius muscle behind the lateral condyle of the femur. It is a variant of normal anatomy and present in humans in 10% to 30% of individuals. Rarely, there are 2 or 3 of these bones (fabella bi- or tripartita). It can be mistaken for a loose body or osteophyte.

The fabella is a standard finding on radiographs of the dog and cat, and both medial and lateral fabellae are typically present.[citation needed]

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