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

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

Parameters Pre-op Post-op P Follow-up P Loss of correction
GK (°) 69.71 ± 16.61 26.62 ± 12.27a <0.001 29.43 ± 11.81b <0.05 2.82 ± 2.42
LL (°) 8.95 ± 12.55 47.64 ± 10.01a <0.001 43.86 ± 9.37b <0.05 3.77 ± 2.94
SVA (mm) 154.51 ± 52.94 34.95 ± 45.42a <0.001 51.85 ± 44.03 0.175
SSA (°) 79.11 ± 11.53 108.68 ± 7.73a <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 ± 13.55b <0.05
DIDW (°) −5.0 ± 8.60 −2.23 ± 7.46b <0.05
AFS (°) 22.76 ± 7.58 22.94 ± 7.74 0.083
PJA (°) 9.70 ± 5.25 12.30 ± 5.11b <0.05
ODI 20.57 ± 13.63 6.63 ± 6.44a <0.05  
NRS 5.94 ± 3.28 2.31 ± 2.24a <0.05  
  1. 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