A normal variation in which an additional small sesamoid bone is located posterior to the knee is termed:

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The additional small sesamoid bone located posterior to the knee is called the fabella. It is a normal anatomical variation found in about 10% of the population. The patella is the largest sesamoid bone in the body, located in the knee joint. The meniscus is a cartilaginous structure in the knee joint that cushions and stabilizes the joint. The mortise is a term used to describe the articulation between the tibia and fibula bones in the ankle joint.

A Normal Variation in Which an Additional Small Sesamoid Bone