Summary of Mean Anatomic Tracking Point Displacements.
| Bending Region | Displacement Direction | Loading Protocol | Mean Displacement (mm) | SD | Statistical Differences |
|---|---|---|---|---|---|
| Neutral1 | PM | 0.0 | ± 0.0 | TW: p = 0.005* | |
| AP | FL | -0.2 | ± 0.3 | TW: p = 0.001* | |
| TW | 1.1 | ± 0.7 | PM, FL | ||
| PM | 0.0 | ± 0.0 | FL: p < 0.0001*, TW: p = 0.0001* | ||
| CC | FL | -0.6 | ± 0.2 | TW: p = 0.017* | |
| TW | -0.4 | ± 0.2 | PM, FL | ||
| Extension2 | PM | -0.8 | ± 0.4 | TW: p = 0.0008* | |
| AP | FL | -1.0 | ± 0.6 | TW: p = 0.0003* | |
| TW | 0.3 | ± 0.9 | PM, FL | ||
| PM | 1.2 | ± 0.5 | FL: p = 0.0022* TW: p = 0.014* | ||
| CC | FL | 0.6 | ± 0.4 | PM | |
| TW | 0.7 | ± 0.3 | PM | ||
| Flexion3 | PM | 1.3 | ± 0.7 | TW: p = 0.001* | |
| AP | FL | 0.9 | ± 0.8 | TW: p < 0.0001* | |
| TW | 2.5 | ± 0.9 | PM, FL | ||
| PM | -2.0 | ± 0.7 | FL: p = 0.0052* | ||
| CC | FL | -2.5 | ± 0.9 | PM | |
| TW | -2.3 | ± 0.8 | FL: p = 0.058 |
Mean anterior-posterior (AP) and cranial-caudal (CC) anatomic tracking point (anterior corner of the L4 end plate) displacements with respect to the β-global coordinate system are tabularized for each of the three loading protocols in the neutral (0Nm bending), fully extended (8Nm) and fully flexed (8Nm) positions. Significant differences are indicated in the last column.
↵* Statistically significant 0.05 CI.