Ligament augmentation with mersilene tape reduces the rates of proximal junctional kyphosis and failure in adult spinal deformity

Abstract

Objective: To investigate prevention of proximal junctional kyphosis (PJK) and failure (PJF) following adult spinal deformity (ASD) surgery utilizing a novel technique of posterior ligament augmentation with polyester fiber tether. Methods: This study evaluated ASD adult patients who underwent posterior decompres-sion and instrumented fusion from the thoracolumbar junction (T9–L1) to the pelvis from 2011–2017. Basic demographic data were obtained. Radiographic outcomes included proximal junctional angle (PJA), sagittal vertical axis, PJK, and PJF. The study population was divided into patients who had ASD surgery with and without ligamentous augmentation. Results: A total of 43 subjects were evaluated, including 20 without and 23 with ligamen-tous augmentation. PJA increased over time for both groups. PJA was smaller for the augmented group, and rate of increase in PJA was slower in the augmented group (p < 0.0001). The rate of PJK was significantly higher in the nonaugmented group (p = 0.01). PJF was significantly less common in the augmented group (p = 0.003). Time to revision surgery was lower in the nonaugmented group (p = 0.003). Conclusion: Our novel ligament augmentation technique utilizing polyethylene tape is an effective technique to slow progression of the PJA and lower the risk for proximal junctional disease in ASD surgery.