Secondary ossification center | Girls | Boys |
Age (range) of appearance | ||
Capitellum | 5 (1 to 11) months | 7 (1 to 26 ) months |
Radial head | 4 (3 to 6) years | 5 (3 to 6) years |
Inner (medial epicondyle) | 5 (5 to 8) years | 7 (7 to 9) years |
Trochlea | 8 (7 to 11) years | 9 (8 to 13) years |
Olecranon | 9 (8 to 10) years | 10 (8 to 11) years |
External (lateral epicondyle) | 11 (8 to 11) years | 12 (9 to 13) years |
Approximate age of fusion | ||
Trochlea | 10 years | 12 years |
External (lateral epicondyle) | 11+ years | 12+ years |
Capitellum | 12 years | 14 years |
Olecranon | 13 years | 15 years |
Radial head | 14 years | 16 years |
Inner (medial epicondyle) | 15 years | 17 years |
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