Effectiveness and Safety of Preoperative Halo Gravity Traction-Assisted Posterior Spinal Fusion Surgery for Severe and Rigid Scoliosis: A Comparative Matched-Cohort Study

Table 2

Comparison of the surgical outcomes between the correction after HGT and non-HGT.

Variable	HGT group N = 27		Non-HGT group N = 47		value
	Mean	SD	Mean	SD
Correction rate of MC (%)	53.80	18.11	43.76	12.38	0.01
Correction rate of FK (%)	45.43	18.29	33.98	20.51	0.02
COBB angle of MC
Preoperation	113.69	26.30	111.94	26.52	0.79
Postoperation	51.25	18.94	63.79	23.75	0.02
^△Prepost	62.43	26.20	48.14	15.62	<0.001
COBB angle of KF
Preoperation	107.26	37.16	74.54	38.74	<0.001
Postoperation	54.96	20.25	49.28	28.94	0.37
^△Prepost	52.30	27.56	25.26	17.56	<0.001
SVA
Preoperation	37.43	25.24	28.56	23.61	0.13
Postoperation	17.21	12.70	29.16	20.36	0.01
^△Prepost	−20.21	26.65	−0.02	27.51	<0.001
TK
Preoperation	91.72	41.65	77.75	23.89	0.07
Postoperation	14.43	8.83	44.85	19.14	<0.001
^△Prepost	77.30	43.23	32.90	15.83	<0.001
AVT
Preoperation	82.40	34.50	73.77	28.32	0.25
Postoperation	55.96	22.78	48.59	33.41	0.31
^△Prepost	26.44	28.24	25.18	23.58	0.83
CVA
Preoperation	27.41	16.78	22.56	33.40	0.49
Postoperation	19.53	11.41	26.46	19.16	0.09
^△Prepost	7.88	18.01	−3.90	33.90	0.10
LL
Preoperation	61.76	28.30	67.12	17.84	0.32
Postoperation	49.35	18.74	52.60	16.41	0.44
^△Prepost	12.41	27.01	12.54	16.62	0.98

BMI: body mass index, HGT: halo-gravity traction; MC: main curve; FK: focal kyphosis; CVA: coronal vertical axis; AVT: apical vertebral translation; LL: lumbar lordosis; TK: thoracic kyphosis; SVA: sagittal vertical axis; means . Esignificance of bold values represents a statistically significant difference.