Fabella is a bean-shaped bone present on the side of the knee. It is an accessory bone, meaning that it may be present or may not be present in people. It disappeared in humans as a part of evolution, but anatomical variations of the bone are often seen in many populations. Usually, it is seen floating inside the tendon behind the knee.
Hi, Welcome to icliniq.com. The extra bone is a sesamoid bone called fabella or cyamella. These sesamoid bones are normal anatomical variants. They are nonfunctional in humans.
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