Peak Calculated Stress (MPa) in the L3–L4 Disc
| R (Ratio) | G, mm | ||||
|---|---|---|---|---|---|
| 0.0 | 0.2 | 0.4 | 0.6 | 0.8 | |
| 45° angle | |||||
| 1 | 7.7096 | 7.5364 | 7.3715 | 7.2067 | 7.0422 |
| 3.6 | 7.6376 | 7.4578 | 7.2866 | 7.1157 | 6.9453 |
| 10 | 7.5644 | 7.3867 | 7.2174 | 7.0485 | 6.8800 |
| 44 | 7.3416 | ||||
| 30° angle | |||||
| 1 | 5.0483 | 4.8767 | 4.7133 | 4.5503 | 4.3882 |
| 3.6 | 4.9999 | 4.8211 | 4.6511 | 4.4814 | 4.3123 |
| 10 | 4.9524 | 4.7754 | 4.6069 | 4.4388 | 4.2712 |
| 44 | 4.8044 | ||||
| 15° angle | |||||
| 1 | 2.4776 | 2.3078 | 2.1472 | 2.0859 | 2.0859 |
| 3.6 | 2.4532 | 2.2759 | 2.1077 | 1.9404 | 1.9101 |
| 10 | 2.4303 | 2.2542 | 2.0870 | 1.9209 | 1.8515 |
| 44 | 2.3569 | ||||
| −15° angle | |||||
| 1 | 4.2420 | 4.0428 | 3.8508 | 3.8508 | 3.8508 |
| 3.6 | 4.2348 | 4.0251 | 3.8066 | 3.7431 | 3.7431 |
| 10 | 4.2215 | 4.0126 | 3.7947 | 3.7093 | 3.7093 |
| 44 | 4.2085 | ||||
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.