Table 1. Key parameters for the lateral mass prosthesis design.
| MLD (mm) a | APD (mm) b | Height (mm) c | Angle (degrees) d | |
|---|---|---|---|---|
| C3 | 11.6 ± 1.2 | 11.5 ± 1.7 | 13.3 ± 1.3 | 51.8 ± 9.7 |
| C4 | 11.7 ± 1.3 | 11.6 ± 1.5 | 13.3 ± 1.1 | 43.4 ± 6.6 |
| C5 | 12.0 ± 1.2 | 11.1 ± 1.2 | 13.6 ± 1.1 | 43.4 ± 7.4 |
| C6 | 12.3 ± 1.3 | 10.9 ± 1.2 | 14.0 ± 1.4 | 33.6 ± 7.7 |
| C7 | 13.3 ± 1.4 | 11.0 ± 1.5 | 16.4 ± 1.6 | 28.1 ± 8.1 |
| Average | 12.2 ± 1.4 | 11.2 ± 1.5 | 14.1 ± 1.8 | 40.1 ± 11.5 |
a
MLD, the mediolateral dimension of the facet joint surface in the coronal plane.
b
APD, the anteroposterior dimension of the facet joint surface in the sagittal plane.
c
Height, the distance between the midpoints of the superior and inferior APD of the lateral mass.
d
Facet joint angle, the angle between the facet joint surface and the height line.