Fig. 3.

Comparison of the thoracolumbar kyphosis angle (TLKA) and sagittal vertical axis (SVA) at each follow-up visit according to the presence of sagittal imbalance. (A) Comparison of TLKA at each follow-up visit. The increase in TLKA over time is greater in the RC group than in the NC group (p=0.000). (B) Comparison of SVA at each follow-up visit. The SVA increases over time more in the RC group than in the NC group (p=0.000). (C) Comparison of TLKA at each follow-up visit. The TLKA increases over time more in the SI group than in the SB group (p=0.000). (D) Comparison of SVA at each follow-up visit. The SVA increases over time more in the SI group than in the SB group (p=0.000). Some patients in the SI group and the RC group who underwent corrective surgery and fusion with instrumentation were not included in these comparisons. RC, recollapsed; NC, non-collapsed; SI, sagittal imbalance; SB, sagittal balance; T0, before vertebroplasty, T1, immediately after vertebroplasty; T2, 1 year after vertebroplasty; T3, 2 years after vertebroplasty.