Peak Calculated Stress (MPa) in the L4–L5 Disc
| R (Ratio) | G, mm | ||||
|---|---|---|---|---|---|
| 0.0 | 0.2 | 0.4 | 0.6 | 0.8 | |
| 45° angle | |||||
| 1 | 2.5972 | 2.7377 | 2.8713 | 3.0043 | 3.1369 |
| 3.6 | 2.7141 | 2.8765 | 3.0317 | 3.1872 | 3.3429 |
| 10 | 2.7601 | 2.9242 | 3.0812 | 3.2386 | 3.3964 |
| 44 | 2.9633 | ||||
| 30° angle | |||||
| 1 | 1.7221 | 1.8579 | 1.9873 | 2.1165 | 2.2448 |
| 3.6 | 1.8010 | 1.9591 | 2.1105 | 2.2624 | 2.4147 |
| 10 | 1.8309 | 1.9912 | 2.1448 | 2.2990 | 2.4537 |
| 44 | 1.9626 | ||||
| 15° angle | |||||
| 1 | 0.8522 | 0.9844 | 1.1106 | 1.1588 | 1.1588 |
| 3.6 | 0.8921 | 1.0470 | 1.1955 | 1.3443 | 1.3713 |
| 10 | 0.9067 | 1.0642 | 1.2153 | 1.3667 | 1.4300 |
| 44 | 0.9717 | ||||
| −15° angle | |||||
| 1 | 0.4319 | 0.8208 | 1.2029 | 1.2029 | 1.2029 |
| 3.6 | 0.4803 | 0.8214 | 1.1828 | 1.2882 | 1.2882 |
| 10 | 0.5368 | 0.8616 | 1.2055 | 1.3410 | 1.3410 |
| 44 | 0.8796 | ||||
Note. MPa = megaPascals. Table entries are the peak stresses (MPa) induced in the L3–L4 disc superior to the dynamic instrumentation component as calculated from the finite element model as a function of (1) angle (+ = flexion, – = extension), (2) dimensionless stiffness ratio R, and (3) axial motion parameter G.