What is the correct anatomical term for the kneecap?

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The kneecap is called the patella. It’s a sesamoid bone embedded in the quadriceps tendon that sits in front of the knee, protecting the joint and improving the leverage of the quadriceps as you straighten the leg. The patella articulates with the femur in the trochlear groove, guiding motion and reducing friction. The other bones mentioned are the tibia (shinbone), the fibula (the slender bone of the outer leg), and the os coxae (the hip bone), which are not the kneecap.