Kneecap
The medical name for the kneecap is the patella. Whichever name — kneecap or patella — you prefer, it is the small bone that is in the front of the knee. The patella is a sesamoid bone, a little bone 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 refers to a "small pan, dish or plate." As a saucer, the patella is quite paltry and cannot have held much.
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knee·cap (neґkap) patella.
Medical dictionary.
2011.