Abstract
BACKGROUND CONTEXT: Complication rates are relatively high in adult deformity surgery. While pseudoarthrosis is widely thought to be the most common complication leading to revision surgery, proximal junctional failure (PJF) may rival or exceed pseudoarthrosis as a reason for revision. The rate of PJF appears to vary based on the level of the upper-instrumented vertebrae (UIV), whereas pseudoarthrosis rate seems to depend on the number of levels fused.
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