The elbow is a joint that joins the arm to the forearm connecting the humerus, ulna and radius bones. It is part of the bony structure.
We commonly call elbow to the posterior and prominent part located in this joint.
The olècranon is the part of the ulna that protrudes into the joint.
Elbow measurements have the olecranon as a reference point.
Anatomy of the human body by Gray, Henry, 1825-1861; Lewis, Warren Harmon, 1870_p. 1328
Go to “Measurement reference points”