Table 1.
Lateral mass screw results
| No. | Segment | Average pressure | Peak pressure | Force | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| No construct | Construct | % decrease | No construct | Construct | % decrease | No construct | Construct | % decrease | ||
| 1 | C4–5 | 0.215 | 0.141 | 34.4 | 0.561 | 0.362 | 35.6 | 17.85 | 11.454 | 35.8 |
| 2 | C6–7 | 0.283 | 0.232 | 18.0 | 1.178 | 0.934 | 20.8 | 30.091 | 19.402 | 35.5 |
| 3 | C4–5 | 0.416 | 0.356 | 14.4 | 0.945 | 0.812 | 14.1 | 53.684 | 32.618 | 39.2 |
| 4 | C6–7 | 0.203 | 0.162 | 20.1 | 0.579 | 0.454 | 21.6 | 17.287 | 12.769 | 26.1 |
| 5 | C4–5 | 0.148 | 0.139 | 6.1 | 0.522 | 0.491 | 6.0 | 16.443 | 12.595 | 23.4 |
| 6 | C6–7 | 0.110 | 0.089 | 19.1 | 0.312 | 0.263 | 15.7 | 12.75 | 9.026 | 29.2 |
Means of the average pressure, peak pressure and force at the intervertebral disc space with an axial load of 90 N for lateral mass screw-rod constructs. Pressure values are reported in megapascals (MPa) and force values are reported in newtons (N)
Average pressure: ** p ≤ 0.005
Peak pressure: ** p ≤ 0.01
Force: ** p ≤ 0.02