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Number of cases of degeneration analyzed by age
| Younger than 50 years | Older than 50 years | |||
|---|---|---|---|---|
| Group A | Group B | Group A | Group B | |
| Disc degenerative change | 3 | 1 | 6 | 4 |
| Anterior osteophyte formation | 7 | 2 | 8 | 3 |
| Instability | 3 | 0 | 1 | 0 |
| Adjacent segment disease | 1 | 0 | 1 | 2 |
