Table 2.
Definitions used for each VF parameter measurement.
| Measurements | Dichotomous Recode | |
|---|---|---|
| C1-2 lateral overhang (AP view) | 0–2 mm | 0–2 mm > 2 mm |
| > 2–4 mm | ||
| > 4–6 mm | ||
| > 6 mm | ||
| C1-2 peri-odontoid symmetry (AP view) |
Symmetrical | Symmetrical Asymmetrical |
| Mildly-Asymmetrical | ||
| Asymmetrical | ||
| C2-7 translation (lat view) | 0–2 mm | 0–2 mm > 2 mm |
| > 2–3 mm | ||
| > 3–4 mm | ||
| > 4 mm | ||
| C2-7 inter-vertebral angulation (lat view) |
< 10 degrees | < 10 degrees 10 + degrees |
| 10 + degrees | ||
| C2-7 SP engagement (lat view) |
In sequence | In sequence Not in sequence |
| Moderately out of sequence | ||
| Markedly out of sequence | ||
| C2-7 SP coupled movement (AP view) | In sequence | In sequence Not in sequence |
| Moderately out of sequence | ||
| Markedly out of sequence | ||
| C2-7 Facet gapping (AP view) | Insignificant | Insignificant Not insignificant |
| Noticeable | ||
| Marked | ||
| C2-7 Facet gapping (obl view) | Insignificant | InsignificantNot insignificant |
| Noticeable | ||
| Marked | ||
| C2-7 facet symmetry (obl view) | Symmetrical | Symmetrical Asymmetrical |
| Mildly-Asymmetrical | ||
| Asymmetrical |
Abbreviations: AP = anterior to posterior, lat = lateral, obl = oblique, mm = millimeters, SP = spinous process.