Table 3.
Sagittal measurements in the anterior dual rod instrumentation group and the posterior pedicle screw instrumentation group
| Mean | Range | Standard deviation | ||||
|---|---|---|---|---|---|---|
| Anterior | Posterior | Anterior | Posterior | Anterior | Posterior | |
| C2–C7 pre | 5.9° | 6.5° | −10° to 22° | −18° to 28° | ±8.6° | ±10.5° |
| C2–C7 post | 2.3° | 6.9° | −18° to 24° | −20° to 40° | ±10.1° | ±14.5° |
| C2–C7 FU | 1.5° | −0.9° | −20° to 20° | −35° to 12° | ±9.6° | ±11.8° |
| PJM pre | 3.8° | 4.6° | −2° to 18° | −2° to 24° | ±4.7° | ±5.7° |
| PJM post | 6.1° | 7.1° | −2° to 18° | −4° to 28° | ±4.9° | ±7.1° |
| PJM FU | 7.4° | 6.6° | 0° to 16° | −2° to 26° | ±5.0° | ±7.8° |
| DJM pre | −1.4° | −7.4° | −10° to 10° | −26° to 9° | ±5.6° | ±9.2° |
| DJM post | −1.9° | −9.9° | −14° to 8° | −30° to 4° | ±6.0° | ±9.5° |
| DJM FU | −2.4° | −11.2° | −24° to 10° | −38° to 9° | ±8.6° | ±12.4° |
| C7/S1 pre (cm) | 1.3 | 1.9 | −2 to 5 | −1 to 5 | ±1.9 | ±2.1 |
| C7/S1 post (cm) | 3.9 | 2.9 | −1 to 6 | −2 to 7 | ±2.1 | ±2.6 |
| C7/S1 FU (cm) | 2.3 | 1.8 | −2 to 5 | −2 to 10 | ±2.2 | ±2.6 |
DJM distal junctional measurement, FU follow-up, PJM proximal junctional measurement, post postoperative, pre preoperative