TABLE 6.
Radiographic Parameters
| Parameters Assessed on Static Radiographs* | n=153 | |||
|---|---|---|---|---|
| Preoperative | Postoperative | Δ | P | |
| Disc Angle | ||||
| Index | 9.2±4.5 | 9.8±4.2 | 0.6±2.9 | 0.004 |
| Above index | 11.8±3.1 | 11.2±3.1 | -0.6±1.7 | 0.006 |
| Below index | 13.9±6.4 | 12.1±5.7 | -1.8±3.0 | <0.001 |
| Disc height | ||||
| Anterior | 10.6±3.0 | 11.5±2.8 | 0.9±1.3 | <0.001 |
| Posterior | 5.2±1.5 | 5.7±1.7 | 0.5±1.0 | <0.001 |
| Mean | 7.9±1.9 | 8.6±1.9 | 0.7±0.8 | <0.001 |
| Global lordosis (L1-L5) | 41.5±9.9 | 39.3±10.2 | -1.3±5.8 | 0.01 |
| Spondylolisthesis (mm)† | ||||
| Index | -4.7±2.5 | -3.1±2.6 | 1.6±1.9 | <0.001 |
| Above index | 1.4±1.5 | 1.4±1.5 | -0.1±0.6 | 0.13 |
| Below index | 1.3±1.6 | 1.3±1.6 | 0.0±0.4 | 0.44 |
| Parameters Assessed on Dynamic Radiographs* | n=90 | |||
| Preoperative | 12 mo Postoperative | Δ | P | |
| Flex/ex ROM | ||||
| Index | 3.9±2.9 | 3.7±3.0 | -0.2±3.4 | 0.55 |
| Above index | 3.2±3.0 | 3.8±3.5 | 0.6±3.4 | 0.13 |
| Below index | 5.4±3.6 | 6.9±4.1 | 1.5±4.1 | <0.001 |
| Flex/ex translation | ||||
| Index | 1.0±0.8 | 0.9±1.0 | -0.1±1.1 | 0.65 |
| Above index | 0.7±0.7 | 0.8±0.7 | 0.1±0.8 | 0.54 |
| Below index | 0.4±0.4 | 0.6±0.5 | 0.2±0.5 | 0.01 |
| Lateral bending ROM | 3.2±2.7 | 3.6±2.6 | 0.4±3.2 | 0.24 |
Continuous variables are displayed as mean (SD).
*
Static radiographs were obtained during the index hospitalization, before dismissal from the hospital. dynamic radiographs were obtained 12 months postoperatively.
†
Retrolisthesis reported as a positive value. anterolisthesis reported as a negative value.
mm indicates millimeters; ROM, range of motion..