Elbow Ossification Centers by Age - CRITOE Mnemonic The ages at which these ossification centers appear are highly variable, but as a general guide, remember 1-3-5-7-9-11 years. C - capitellum R - radial head I - internal epicondyle T - trochlea O - olecranon E - external epicondyle #Diagnosis #Pediatrics #Peds #CRITOE #Mnemonic #Elbow #Ossification #Ages