The Influence of Natural Head Position on the Cervical Sagittal Alignment

Table 1

Radiographic measurements related to natural head position and cervical alignment.

Variable	N	Min	Max	Mean	SD
McGS (°)	103	−12.00	20.90	6.14	6.10
C0–C2 angle (°)	103	0.80	34.80	16.61	7.39
C2–C5 angle (°)	103	−19.70	21.50	2.88	7.71
C5–C7 angle (°)	103	−11.80	17.30	4.52	6.61
C2–C7 angle (°)	103	−16.80	30.30	7.40	9.55
T1 slope (°)	103	8.70	43.40	23.31	6.64
C0–C2 SVA (mm)	103	−16.50	22.30	1.36	6.77
C2–C7 SVA (mm)	103	−4.60	49.80	17.91	8.54
CG–C7 SVA (mm)	103	−12.00	72.10	19.27	13.12

McGS: slope of McGregor’s line; SVA: sagittal vertical axis.