Table 2.
Comparison of the mechanical parameters associated with the load–displacement response of the intact and failed vertebrae.
| Characteristic | Parameter | Intact | Failed | p (I-F) |
|---|---|---|---|---|
| Compression | σU(N) | 2246.3 (897.0) | 1409.1 (693.2) | < 0.001 |
| S(N/mm) | 382.1 (194.2) | 250.1 (130.3) | < 0.05 | |
| Flexion | σU(Nm) | 62.7 (26.3) | 36.9 (21.4) | < 0.01 |
| S(Nm/mm) | 11.4 (5.3) | 9.2 (10.9) | NS | |
| A-P shear | σU(N) | 502.3 (278.4) | 308.6 (195.8) | < 0.01 |
| S(N/mm) | 105.6 (39.7) | 62.7 (41.9) | < 0.01 | |
| Lateral Bend | σU(Nm) | 13.1 (17.2) | 5.6 (5.3) | < 0.05 |
| S(Nm/mm) | 0.9 (2.7) | 0.4 (1.7) | NS | |
| M-L shear | σU(N) | 18.9 (33.8) | 0.2 (41.60 | NS |
| S(N/mm) | 0.9 (3.4) | 2.0 (5.6) | NS |
A-P: along the Anterior-Posterior vertebral plane, M-L: along the transverse vertebral plane.
σy: Yield strength, σU: Ultimate strength. S: Stiffness. (I-F): Intact vs. Failed. Values presented in mean (SD). NS: p > 0.05.