Objective To investigate the appearance time of six secondary ossification centers of elbow in children. Methods The radiological data of 8007 children with elbow trauma in our hospital were collected through Picture Archiving and Communications System (4960 males and 3047 females). Age was ranged from 2 months to 215 months, with a median age of 66 (43-97) months for boys and 56 (32-85) months for girls. Age groups were divided into 15 groups at 12-month intervals. Results In more than 50% of secondary ossification centers appeared, the youngest age group of girls was earlier than that of boys. The appearance of capitulum, radius head, internal epicondyle, olecranon, trochlea, and external epicondyle in girls was 13 months, 71 months, 64 months, 108 months, 112 months, and 122 months, respectively, earlier than that of boys at 19 months, 82 months, 95 months, 132 months, 135 months, and 145 months. The six secondary ossification centers appeared in the sequence of capitulum, radius head, internal epicondyle, olecranon, trochlea, and external epicondyle, while the appearance of internal epicondyle in girls was earlier than radius head. Conclusions The appearance of secondary ossification center of Children's elbow in girls is earlier than in boys, and there is a certain sequence of appearance, which is helpful for film reading and bone age evaluation of elbow.
Key words
Secondary ossification center /
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Elbow /
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Children
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