CRITOE CRITOE is a mnemonic used to determine skeletal age from x-rays of a child's elbow. It stands for:
R: Radial head
I: Internal (medial) epicondyle
E: External (lateral) epicondyle
These letters represent the order in which the secondary ossification centers of the elbow appear and fuse. The appearance of secondary ossification centers of the elbow is predictable, but may vary from patient to patient based on sex, maturity, and may even vary from one extremity to the other. The CRITOE mnemonic can be used to remember the chronologic order of ossification.