ossification centers of the elbow
There are six ossification centers of the elbow that appear and develop in a relatively reproducible fashion, and are key to assessment of the pediatric elbow radiograph. Timing of their appearance varies in the literature but an approximation is given below. A useful mnemonic to remember the order of development is CRITOL or CRITOE (see video below).
- capitellum: 2-24 months
- radial head: 3-6 years
- internal (medial) epicondyle: 4-7 years
- trochlea: 8-10 years
- olecranon 8-10 years
- external (lateral) epicondyle: 10-13 years