Proximal junctional kyphosis is a compensation for post-operative negative C2-FH in ASD patients: a cross-sectional study

Table 4 Comparison of follow-up data between PJK group and non-PJK group

Parameters	Non-PJK group (n = 44)	PJK group (n = 24)	p value
C2-FH (mm)	− 17.96 ± 12.24	− 11.78 ± 23.92	0.486
TK (°)	26.38 ± 14.79	28.42 ± 10.87	0.772
CL (°)	20.03 ± 11.71	32.83 ± 18.45	0.098
LL (°)	38.84 ± 13.25	23.55 ± 14.28	0.043***
SVA (mm)	18.21 ± 23.55	45.3 ± 58.89	0.192
TPA (°)	16.81 ± 5.74	33.13 ± 6.03	< 0.000***
PI (°)	49.84 ± 7.71	50.14 ± 9.64	0.945
PT (°)	22.02 ± 5	37.13 ± 5.21	< 0.000***
SS (°)	27.82 ± 8.4	13 ± 7.23	0.002***
PJA (°)	9.92 ± 8.91	20.47 ± 7.41	0.06

C2-FH the distance between C2 vertical line to the femoral heads, CL cervical lordosis, TK thoracic kyphosis, LL lumbar lordosis, PT pelvic tilt, PI pelvic incidence, SS sacral slope, SVA sagittal vertical axis, TPA T1-Pelvic angle, PJA proximal junctional angle, *** p<0.05

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