The effectiveness and safety of staged halo-pelvic traction combined with posterior spinal fusion in the treatment of severe rigid spine deformity: a prospective cohort study

Table 2 Radiographic parameters

Parameter	Pre-traction	Post-traction	P-value ^a	Post-PSF	P-value ^b	Final FU	P-value ^c
Cobb angle (°)	114.2 ± 38	55.3 ± 22.3	< 0.001	47.4 ± 22.7	< 0.001	47.1 ± 23.2	0.855
MK (°)	105.8 ± 34.7	52.6 ± 22.6	< 0.001	38.1 ± 21.9	< 0.001	38.5 ± 20.9	0.7
TK (°)	87.7 ± 31.5	52 ± 24.3	< 0.001	44.7 ± 22.6	0.003	44.6 ± 22.4	0.926
LL (°)	65.7 ± 22	46.8 ± 18.7	< 0.001	42.2 ± 15.5	0.033	42.1 ± 16	0.905
PT (°)	10.9 ± 7.6	10.1 ± 6.5	0.448	11 ± 6.3	0.267	12.8 ± 7.7	0.064
SS (°)	25.7 ± 9.2	23.7 ± 7.9	0.086	22.7 ± 8.8	0.222	21.8 ± 7.9	0.179
TPA (°)	7.7 ± 5.6	7.1 ± 5.7	0.544	9 ± 6.3	0.059	9.2 ± 4.6	0.688
C7PL-CSVL (mm)	26.9 ± 25.8	20.4 ± 23.3	0.053	26.5 ± 24.3	0.02	23.6 ± 19.2	0.143
SVA (mm)	16.9 ± 22.2	22.4 ± 37.6	0.233	23.7 ± 27	0.801	24.4 ± 22.4	0.79
AVT (mm)	89.3 ± 36.2	64.9 ± 29.9	< 0.001	44.7 ± 27.8	< 0.001	42.2 ± 24.9	0.087

a, Post-traction vs. Pre-traction; b, Post-PSF vs. Post-traction; c, Final FU vs. Post-PSF
PSF, posterior spinal fusion; FU, follow-up; MK, maximal kyphosis; TK, thoracic kyphosis; LL, lumbar lordosis; PT, pelvic tilt; SS, sacral slope; TPA, T1 pelvic angle; C7PL-CSVL, C7 plumb line to center sacral vertical line; SVA, sagittal vertical axis; AVT, apical vertebral translation

ISSN: 1749-799X