Table 1 Elastic tissue material properties of various spinal structures in FE model.
Component | Element type | E/MPa | v | Stiffness(N/mm) |
|---|---|---|---|---|
Cortical bone | Isotropic, Tetra element | 12,000 | 0.3 | / |
Cancellous bone | Isotropic, Tetra element | 100 | 0.2 | / |
Osteoporotic Cortical bone | Isotropic, Tetra element | 8040 | 0.3 | / |
Osteoporotic Cancellous bone | Isotropic, Tetra element | 34 | 0.2 | / |
Normal nucleus pulposus | Isotropic, Hex element | 1.0 | 0.49 | / |
Moderately degenerative nucleus pulposus | Isotropic, Hex element | 2.0 | 0.49 | / |
Normal annulus fibrosus | Isotropic, Hex element | 4.2 | 0.45 | / |
Moderately degenerative annulus fibrosus | Isotropic, Hex element | 2.5 | 0.40 | / |
Endplate | Isotropic, Hex element | 25 | 0.25 | / |
Articular cartilage | Isotropic, Hex element | 24 | 0.3 | / |
Pedicle screw and rod | Isotropic, Tetra element | 110,000 | 0.3 | / |
Cage | Isotropic, Tetra element | 3600 | 0.3 | / |
SSL | Spring | / | / | 3.82 |
ISL | Spring | / | / | 0.19 |
AL | Spring | / | / | 8.74 |
PLL | Spring | / | / | 5.83 |
IL | Spring | / | / | 2.39 |
LF | Spring | / | / | 15.75 |
