Long-term risk of ASD in Isthmic Spondylolisthesis Treated with Posterior Interbody Fusion.

Objective: Posterior Interbody fusion can be associated to adjacent segment disease (ASD) some years after surgery. The aim of this study is to confirm the rate of ASD in isthmic spondylolisthesis treated by posterior fusion.

Methods: Patients treated by posterior lumbar fusion were collected between January 2014 to June 2022.