Research Article
Effects of the Insertion Type and Depth on the Pedicle Screw Pullout Strength: A Finite Element Study
Table 3
Mechanical properties adopted for normal and osteoporotic bone structures as well as the titanium alloy used for pedicle screws.
| | | (g/cm3) | (MPa) | | (MPa) | (%) |
| | Normal bone | Cortical | 1.6 | 12,000 | 0.3 | 100 | 3 | | Subcortical | 0.5 | 360 | 0.3 | 14.5 | 20 | | Trabecular | 0.2 | 100 | 0.2 | 3 | 40 |
| | Osteoporotic bone | Cortical | 1 | 2900 | 0.3 | 40 | 3 | | Subcortical | 0.3 | 78 | 0.3 | 6 | 20 | | Trabecular | 0.13 | 75 | 0.2 | 1.5 | 40 |
| | Pedicle screws | Titanium | — | 124,000 | 0.3 | — | — |
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