Table 1.

Comparison of the preoperative and postoperative radiographic parameters following three-column osteotomy (paired t test).

	Preoperative		1 Year
	Mean	SD	Mean	SD	Paired t test; P Value
CPL	38.74	19.91	38.32	19.17	.684
C2S	14.62	12.99	16.46	12.77	.019
CL	18.31	17.49	11.61	16.63	.0001
T1S	33.89	15.17	28.08	13.18	.266
TS-CL	15.58	12.89	16.46	12.22	.0001
TK_T2	−36.99	25.26	−46.68	16.64	.0001
TK_T4	−34.40	23.77	−39.77	15.71	.0001
LL	30.94	25.20	54.91	15.07	.0001
PT	30.32	12.97	22.85	11.45	.0001
PI-LL	26.89	26.56	3.25	16.75	.0001
SVA	117.46	81.65	29.73	57.28	.0001
CTPA	2.78	2.09	3.55	1.92	.0001
CPA	35.28	15.50	22.06	12.25	.0001
TPA	32.50	15.94	18.51	12.01	.0001

Abbreviations: CPL, C2-C7 plumb line; C2S, C2 slope; CL, cervical lordosis; T1S, T1 slope; TS-CL, T1 slope minus CL; TK_T2, T2_T12 kyphosis; TK_T4, T4_T12 kyphosis; LL, lumbar lordosis; PT, pelvic tilt; PI-LL, pelvic incidence minus LL; SVA, sagittal vertical axis; CTPA, cervico-thoracic pelvic angle; CPA, C2 pelvic angle; TPA, T1 pelvic angle.