Table 4.
Groupwise Correlations of T1-UIV Angle Measured Using Preoperative Whole Spine Full Flexion Lateral Radiograph, Postoperative Radiograph, and Final Follow-up Radiograph.
| Preop | Full flexion | Postop | Final-follow | Full flexion and postop | Full flexion and final-follow | |||
|---|---|---|---|---|---|---|---|---|
| r | P | r | P | |||||
| All patients | 17.3 ± 15.1 | 31.7 ± 10.9 | 29.5 ± 8.8 | 33.5 ± 9.5 | 0.64 | P < .01* | 0.69 | P < .01* |
| Ideal group | 12.6 ± 17.0 | 34.2 ± 13.2 | 29.6 ± 9.3 | 34.0 ± 12.1 | 0.77 | P < .01* | 0.89 | P < .01* |
| Non-Ideal group | 22.0 ± 11.7 | 29.1 ± 7.6 | 29.5 ± 8.7 | 33.0 ± 6.5 | 0.44 | ns | 0.35 | ns |
Abbreviations: preop, preoperative radiograph; full flexion, whole spine full flexion lateral radiograph; postop, postoperative radiograph; final-follow, final follow-up radiograph; T1-UIV, angle between T1 and UIV.