Table 4.

Correlation of CTIP to Regional and Global Alignment Parameters.

Parameter	CTIP (r)	P-value
CTIP	1.00	-
OC2-Cervical lordosis (°)	0.21	<.00001
C2C7 lordosis (°)	0.38	<.0001
C7 slope angle (°)	0.25	<.00001
T1 slope angle (°)	0.33	<.00001
Cervical sagittal vertical axis; cSVA (mm)	−0.26	<.00001
T1 pelvic angle (°)	0.12	0.01
T1-T12 Kyphosis (°)	0.26	<.0001
T4-T12 Kyphosis (°)	0.33	<.0001
Thoracic kyphosis (°)	0.32	<.00001
Lumbar lordosis (°)	−0.04	0.37
Sagittal vertical axis; SVA (mm)	0.25	<.00001
Global sagittal alignment (°)	0.17	<.001
Sacral slope (°)	−0.03	0.46
Pelvic tilt (°)	0.04	0.39
Pelvic incidence (°)	0.00	0.98

P < 0.01 indicates statistical significance.