Correlation between baseline radiographic measurements and perioperative change in neuroforaminal height.
| Unstandardized Coefficients | Standardized Coefficient | Significance | |||
| B | Standard Error | Beta | t | ||
| Preoperative disc space height, mm | −0.1 | .01 | −0.04 | −0.4 | 0.71 |
| Preoperative osteophytes gradea | 0.7 | 0.6 | 0.1 | 1.3 | 0.18 |
| Preoperative foraminal height, mm | −0.3 | 0.1 | −0.3 | −2.7 | 0.01 |
| Preoperative foraminal width, mm | 0.2 | 0.2 | 0.1 | 0.9 | 0.36 |
| Preoperative facet joint degeneration gradeb | −0.1 | 0.3 | −0.02 | −0.2 | 0.81 |
| Preoperative coronal Cobb angle, ° | 0.02 | 0.1 | 0.03 | 0.3 | 0.74 |
| Implant positionc | −0.3 | 0.6 | -0.04 | −0.5 | 0.65 |
| Anatomic level | 0.2 | 0.4 | 0.04 | 0.4 | 0.68 |
↵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).