Following are the material properties [6] used in the lumbar motion segment analysis:
| Human Vertebral Motion Segment Material Properties | |||
|---|---|---|---|
| Property | Annulus Bulk | Nucleus Pulposus | Bone |
| Elastic Modulus (MPa) | 2.5 | 1.5 | 3500 |
| Poisson's Ratio | 0.1 | 0.1 | 0.2 |
| Permeability (m4N-1s-1) | 3.0E - 16 | 3.0E - 16 | --- |
The permeating fluid and the solid phase are both assumed to be incompressible, so the Biot modulus α is set to 1.