Mean pre- and postoperative radiographic values.
| Group | L5–S1 Lordosis (°) | L5–S1 Disc Angle (°) | Disc Height, mm | |||
| Preop | Postop | Preop | Postop | Preop | Postop | |
| Cohort | 15.7 | 25.3 | 8.1 | 19.7 | 4.0 | 7.6 |
| A | 16.0 | 25.6 | 7.9 | 19.2 | 4.2 | 7.1 |
| B | 15.4 | 25.0 | 8.3 | 20.2 | 3.8 | 8.1 |
Abbreviations: postop, postoperative; preop, preoperative.
Note: Cohort = all patients. 1–50; A = patients 1–25. B = patients 26–50.