Table 4 The stiffness (Nm/degrees) of intact spine, S0 screw, S1.5 screw, S2.0 screw, and S2.5 screw model in four loading conditions
Groups loading | Intact | S0 | S1.5 | S2.0 | S2.5 |
|---|---|---|---|---|---|
Rotation | 4.75 | 5.40 | 5.39 | 5.41 | 5.41 |
Lateral bending | 3.05 | 9.46 | 9.48 | 9.38 | 9.48 |
Extension | 5.40 | 21.02 | 20.96 | 20.69 | 20.38 |
Flexion | 3.27 | 10.75 | 10.95 | 10.77 | 11.03 |