Patella or Patella

Generality

The patella, or patella, is the protruding bone, identifiable by touch, which is located on the anterior part of the knee joint.
Fundamental to the extension of the leg, this bony element is very reminiscent of an inverted triangle.

The upper margin (ie the base of the hypothetical triangle) and the sides of the patella act as a point of attachment for the tendons of the muscles making up the quadriceps of the thigh. The lower margin, on the other hand, serves as the insertion site of the so-called patellar tendon (or ligament); the latter connects the patella with the tibia.
In addition to ensuring leg extension (a fundamental mechanism for locomotion), the patella also serves to increase the efficiency of the quadriceps muscle and to protect the internal anatomical structures of the knee.

So is the Patella

The patella, or patella, is the protruding, palpable bone that resides in front of the knee joint, at the border between the thigh bone (the femur) and the leg bone (the tibia).

IT'S A SESAMOID BONE

Anatomy experts include the patella in the category of sesamoid bones, that is, those bones that possess a similar appearance to sesame seeds.
Other examples of sesamoid bones, present in the human body, are: the pisiform bone of the carpus of the hand and the lenticular process of the anvil (one of the three ossicles of the middle ear).

Anatomy

The patella is a thick, triangular-shaped bony element with an "important anterior surface and an" equally important posterior surface.
As a triangle, it is inverted: the apex of the patella is projected downwards, therefore from the side of the tibia; while the base is facing upwards, therefore it is in the direction of the femur.