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The fabella (Latin for little bean) 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 an accessory bone, an anatomical variation present in 39% of humans. Rarely, there are two or three of these bones (fabella bi- or tripartita). It can be mistaken for a loose body or osteophyte.
Although the fabella seems to have disappeared with the evolution of Hominidae, it reappeared in humans sometime after they diverged from chimpanzees. It is unknown whether it reappeared soon after this divergence, 5–7 million years ago, or more recently in human evolution .
- Berthaume, Michael A.; Di Federico, Erica; Bull, Anthony M. J. (April 17, 2019). "Fabella prevalence rate increases over 150 years, and rates of other sesamoid bones remain constant: a systematic review". Journal of Anatomy. Wiley. doi:10.1111/joa.12994.
- "Sore knee? Maybe you have a fabella". BBC News. April 19, 2019.
- Sarin, Vineet K.; Erickson, Gregory M.; Giori, Nicholas J.; Bergman, A. Gabrielle; Carter, Dennis R. (1999). "Coincident development of sesamoid bones and clues to their evolution". The Anatomical Record. Wiley. doi:10.1002/(SICI)1097-0185(19991015)257:5%3C174::AID-AR6%3E3.0.CO;2-O.
- Duncan W, Dahm D: "Clinical anatomy of the fabella" Clin Anat, 16(5), pp. 448–449 (2003) PMID 12903068, doi:10.1002/ca.10137
- Werner, Platzer: Color Atlas of Human Anatomy, Vol. 1: Locomotor System (7th ed.), published by Thieme, 2015 (ISBN 978-3-13-533306-9)
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