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| Anatomy | Age (years) of appearance of ossification centre on radiograph | Age (years) of fusion |
| Capitellum | 0-2 | 13-16 |
| Radial head | 3-6 | 13-17 |
| Medial epicondyle | 3-9 | up to 20 |
| Trochlea | 7-13 | 13-16 |
| Olecranon | 8-10 | 13-16 |
| Lateral epicondyle | 8-12 | 13-16 |