| CDD | Cervical Disc Degeneration |
| F | Female |
| M | Male |
| L | Lateral projection |
| HDI | Horizontal displacement index |
| ROM | Range of angular motion |
| CIF | Curvature index in flexion |
| CIE | Curvature index in extension |
| tCIE | Total curvature index in extension |
| tCIF | Total curvature index in flexion |
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