Failures and revisions in surgery for sagittal imbalance: analysis of factors influencing failure

i) Study design: Retrospective observational cohort study
ii) Causes of failure were insufficient correction, junctional kyphosis, screw loosening and pseudoarthrosis with rod breakage.
iii) In each of the 12 cases, patients presented a new onset or a worsening of sagittal imbalance and pain.

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