Table 2. Comparison of stress on L4 pars, adjacent intradiscal pressure (MPa).
| Stress on L4 pars | L3-L4 intradiscal pressure | L4-L5 intradiscal pressure | ||||
|---|---|---|---|---|---|---|
| Before surgery | Short-segment PLIF | Before surgery | Short-segment PLIF | Before surgery | Short-segment PLIF | |
| Neutral | 73.097 | 72.034 | 1.024 | 1.024 | 0.640 | 0.597 |
| Flexion | 91.366 | 93.436 | 1.941 | 1.940 | 1.160 | 1.150 |
| Extension | 98.177 | 99.669 | 0.110 | 0.109 | 0.877 | 0.853 |
| Lateral bending | 93.590 | 94.002 | 0.903 | 0.904 | 1.993 | 2.160 |
| Axial rotation | 162.075 | 158.826 | 0.767 | 0.786 | 1.639 | 1.307 |