(b).
| Alignment parameters | pre-OP | 1 M | 1 Y |
|---|---|---|---|
| C7PL-CSVL | 62 | 3 | 2 |
| SVA | 119 | 12 | 11 |
| Cobb angle | 29 | 4 | 8 |
| LL | 4 | 42 | 45 |
| PT | 24 | 21 | 27 |
| PI-LL | 50 | 12 | 9 |
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