Table 2.
Cervical Anatomical Considerations.
| NO. Screws (N = 46) | C2 (N = 8) | C3 (N = 8) | C4 (N = 8) | C5 (N = 8) | C6 (N = 8) | C7 (N = 6) a | P-value | |
|---|---|---|---|---|---|---|---|---|
| PH (mm) | 7.10 (1.19) | 8.14 (1.89) | 6.36 (.88) | 7.16 (.89) | 6.97 (.66) | 6.51 (.80) | 7.48 (.95) | .009 b |
| PW (mm) | 5.37 (1.21) | 5.55 (1.21) | 4.34 (.96) | 4.48 (.60) | 5.76 (1.11) | 6.01 (1.26) | 6.31 (.63) | .001 b |
| TPA (°) | 39.9 (5.34) | 46.9 (4.61) | 40.1 (2.18) | 39.5 (3.88) | 39.6 (3.31) | 37.5 (4.02) | 34.4 (6.06) | <.001 b |
| MSL (mm) | 37.1 (6.67) | 26.3 (4.80) | 35.2 (3.30) | 38.5 (4.55) | 41.8 (4.32) | 40.7 (4.47) | 41.0 (1.38) | <.001 b |
Numbers in rows are mean and standard deviation; Abbreviations: MSL, maximal screw length; PH, pedicle height; PW, pedicle width; SPA, sagittal pedicle angle; TPA, transverse pedicle angle.
aThe C7 vertebral level was out of the plane of the preoperative scan on the one of the specimens, and anatomical measurements could not be attained.
bDenotes statistical significance.