Patella: The kneecap by another name, the patella is the small bone that is in the front of the knee.
The patella is a sesamoid bone, a little bone (sesamoid = like a sesame seed) that is embedded in a joint capsule or tendon, in this case the tendon of insertion of the quadriceps muscle (the "quad"). The patella in an adult is about 2 inches (5 cm) across.
If the patella is shattered beyond repair, it can be removed. The operation is termed a patellectomy.
Patella is a Latin word that referred to a "small pan, dish or plate." As a saucer, the patella is quite paltry and cannot have held much.