Ossification centers of the elbow

The six ossification centers in the pediatric elbow are shown numbered in the order of appearance with age range for appearance by sex: Capitellum, radial head, internal (medial) epicondyle, trochlea, olecranon, external (lateral) epicondyle (mnemonic: CRITOE). These secondary ossification centers later fuse to create the mature bony elbow. The salmon-shaded regions represent unossified cartilage.