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The changes of Cobb angle before and after operation were compared between the two groups.
| Group | Preoperative | Postoperative | After 1 year |
|---|---|---|---|
| Anterior | 25.1 ± 8.9 | 3.4 ± 1.7 | 4.6 ± 1.6 |
| Posterior | 23.7 ± 7.6 | 3.2 ± 1.4 | 8.2 ± 2.1 |
| T value | 0.757 | 0.574 | 9.343 |
| P value | 0.452 | 0.567 | 0.001 |
