Correlation between baseline radiographic measurements and perioperative change in neuroforaminal width.
| Unstandardized Coefficients | Standardized Coefficient | Significance | |||
| B | Standard Error | Beta | t | ||
| Preoperative disc space height, mm | −0.02 | 0.1 | −0.02 | −0.2 | 0.82 |
| Preoperative osteophytes gradea | −0.6 | 0.3 | −0.2 | −1.8 | 0.08 |
| Preoperative foraminal width, mm | −0.7 | 0.1 | −0.5 | −6.8 | 0.01 |
| Preoperative facet joint degenerationb | 0.4 | 0.2 | 0.2 | 1.8 | 0.08 |
| Preoperative coronal Cobb angle, ° | −0.01 | 0.03 | −0.03 | −0.4 | 0.73 |
| Implant positionc | −0.3 | 0.4 | −0.1 | −0.9 | 0.37 |
| Anatomic level | −0.3 | 0.2 | −0.1 | −1.1 | 0.26 |
a Three grades: I, nonbridging disc space osteophytes; II, small bridging disc space osteophytes; III, ankylosed disc space.
↵b Three grades: I, nonbridging osteophytes of the facet joint; II, small bridging osteophytes of the facet joint; III, ankylosed facet joint.
↵c Location of the center of the interbody device in relation to 4 quadrants, which the disc space has been divided into on sagittal imaging (I anterior to IV posterior).