Average angles and translations measured for both VMA and FE imaging radiographs (N = 2239 intervertebral levels).
| Panel A. IVR measured in degrees (°) | ||||||||||
| FE | VMA (Standing) | VMA (Lying) | Δ VMA (Standing)-FE | Δ VMA (Lying)-FE | ||||||
| Level | Mean | Std Dev | Mean | Std Dev | Mean | Std Dev | Mean | Std Dev | Mean | Std Dev |
| L1-L2 | 5.9 | 2.3 | 7.6 | 4.3 | 8.6 | 3.6 | 1.7** | 2.0 | 2.7** | 1.3 |
| L2-L3 | 6.8 | 2.4 | 11.2 | 4.8 | 10.1 | 3.7 | 4.4*** | 2.4 | 3.3*** | 1.3 |
| L3-L4 | 7.7 | 2.6 | 10.1 | 5.1 | 9.2 | 4.1 | 2.4** | 2.5 | 1.5* | 1.5 |
| L4-L5 | 9.1 | 3.3 | 11.9 | 7.1 | 8.3 | 4.4 | 2.8** | 3.8 | 0.8 | 1.1 |
| L5-S1 | 8.5 | 4.2 | 8.1 | 6.2 | 10.3 | 4.6 | 0.4 | 2.0 | 1.8* | 0.4 |
| Average | 7.6 | 3.0 | 9.8 | 5.5 | 9.3 | 4.1 | 2.3** | 2.5 | 2.0** | 1.1 |
| Panel B. IVT in percentage vertebral body depth (%) | ||||||||||
| FE | VMA (Standing) | VMA (Lying) | Δ VMA (Standing)-FE | Δ VMA (Lying)-FE | ||||||
| Level | Mean | Std Dev | Mean | Std Dev | Mean | Std Dev | Mean | Std Dev | Mean | Std Dev |
| L1-L2 | 4.4 | 1.4 | 5.7 | 3.8 | 5.4 | 2.3 | 1.3* | 2.4 | 1.0 | 0.9 |
| L2-L3 | 5.2 | 1.3 | 6.1 | 4.0 | 7.9 | 2.1 | 0.9 | 2.7 | 2.7** | 0.8 |
| L3-L4 | 5.9 | 1.5 | 6.6 | 4.5 | 9.0 | 2.7 | 0.7 | 3.0 | 3.1** | 1.2 |
| L4-L5 | 7.7 | 2.1 | 5.8 | 5.2 | 8.3 | 2.0 | 1.9* | 3.1 | 0.6 | 0.1 |
| L5-S1 | 6.9 | 3.3 | 6.4 | 3.7 | 2.8 | 1.1 | 0.5 | 0.5 | 4.1*** | 2.2 |
| Average | 6.0 | 1.9 | 6.1 | 4.2 | 6.7 | 2.1 | 1.04* | 2.3 | 2.3** | 1.1 |