Table 1 Material parameters and element types of the model
Unit type | Elastic modulus | Poisson’s ratio | Thickness/mm | |
|---|---|---|---|---|
Cortical bone | S4R | 12 000 | 0.3 | 0.5 |
Cancellous bone | C3D8R、C3D4 | 100 | 0.2 | — |
Rear structure | C3D8R、C3D4 | 3 500 | 0.25 | — |
Endplate | S4R | 2500 | 0.25 | 0.5 |
Articular cartilage | C3D8R | 25 | 0.4 | — |
Nucleus pulposus | C3D8R | 1.0 | 0.499 9 | — |
Annulus | C3D8R | 4.2 | 0.45 | — |
Anterior longitudinal ligament | T3D2 | 7.8 | 0.3 | — |
Posterior longitudinal ligament | T3D2 | 10 | 0.3 | — |
Ligamentum flavum | T3D2 | 15 | 0.3 | — |
Interspinous ligament | T3D2 | 10 | 0.3 | — |
Supraspinous ligament | T3D2 | 8 | 0.3 | — |
Intertransverse ligament | T3D2 | 10 | 0.3 | — |
Joint capsule ligament | T3D2 | 7.5 | 0.3 | — |