The patterns of loss of correction after posterior wedge osteotomy in ankylosing spondylitis-related thoracolumbar kyphosis: a minimum of five-year follow-up

Table 1 Radiographic and clinical assessment of preoperative, postoperative and the final follow-up data (n = 24)

Parameters	Pre-op	Post-op	P	Follow-up	P	Loss of correction
GK (°)	69.71 ± 16.61	26.62 ± 12.27^a	<0.001	29.43 ± 11.81^b	<0.05	2.82 ± 2.42
LL (°)	8.95 ± 12.55	47.64 ± 10.01^a	<0.001	43.86 ± 9.37^b	<0.05	3.77 ± 2.94
SVA (mm)	154.51 ± 52.94	34.95 ± 45.42^a	<0.001	51.85 ± 44.03	0.175	–
SSA (°)	79.11 ± 11.53	108.68 ± 7.73^a	<0.001	107.79 ± 10.35	0.581	–
OVA (°)	–	−29.17 ± 7.71	–	−28.04 ± 7.90	0.057	–
KPNS (°)	–	25.95 ± 12.35	–	29.76 ± 13.55^b	<0.05	–
DIDW (°)	–	−5.0 ± 8.60	–	−2.23 ± 7.46^b	<0.05	–
AFS (°)	–	22.76 ± 7.58	–	22.94 ± 7.74	0.083	–
PJA (°)	–	9.70 ± 5.25	–	12.30 ± 5.11^b	<0.05	–
ODI	20.57 ± 13.63	–	–	6.63 ± 6.44^a	<0.05
NRS	5.94 ± 3.28	–	–	2.31 ± 2.24^a	<0.05

GK global kyphosis, LL lumbar lordosis, SSA spinal-sacral angle, SVA sagittal vertical axis, OVA osteotomized vertebra angle, KPNS kyphosis of non-fused segment, DIDW distal intervertebral disc wedging, AFS angle of fused segments, PJA proximal junctional angle, ODI Oswestry Disability Index, NRS: Numerical Rating Scale; “^a”: statistically significant in comparison with the preoperative result; “^b”: statistically significant when compared to the postoperative result

ISSN: 1471-2474