Salvage of failed Posterior Sacroiliac Joint Fusion with Single Compressive Lateral Transfixing Implant.

Introduction: Sacroiliac joint (SIJ) dysfunction is a common, underdiagnosed source of chronic axial low back pain, affecting up to 30% of patients. Minimally invasive SIJ fusion is effective after failed conservative care. Posterior allograft fusion offers soft tissue preservation but raises concerns about durability, especially in high-risk patients. Lateral transiliac fixation provides cortical engagement and immediate stability. This report describes successful salvage of a failed posterior SIJ fusion using a lateral compressive implant in a veteran.