Sesamoid bones are seed-like bony nodules that develop in certain muscle tendons that rub against the convex bony surface during joint movement. The rubbing surface of the sesamoid bone is covered with articular cartilage.
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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