Table 1 Material properties of the lumbosacral FE model and spinal implants
Component | Young’s Modulus (MPa) | Poisson’s Ratio |
|---|---|---|
Annulus Fiber | ||
Inner Laminate: Inner Layer | 360 | 0.30 |
Inner Laminate: Middle Layer | 385 | 0.30 |
Inner Laminate: Outer Layer | 420 | 0.30 |
Outer Laminate: Inner Layer | 440 | 0.30 |
Outer Laminate: Middle Layer | 495 | 0.30 |
Outer Laminate: Outer Layer | 550 | 0.30 |
Annulus Ground Substance | 4.2 | 0.45 |
Nucleus Pulposus | 1 | 0.49 |
Cancellous Bone | 100 | 0.20 |
Cortical Bone | 12,000 | 0.30 |
Posterior Bony Elements | 3500 | 0.25 |
Endplate | 12,000 | 0.30 |
ALL/PLL/LF/ISL/SSL | 20/20/20/10/10 | 0.25 |
DIAM core | 20 | 0.45 |
DIAM Truss | 5000 | 0.20 |
Graft Bone | 100 | 0.20 |
PEEK | 3600 | 0.25 |
Titanium screw/rod | 110,000 | 0.30 |