Posterior Sacroiliac Joint Fusion for Severe Sacroiliac Joint Disorders: A Technical Note on Surgery Using Transarticular Cylindrical Cages Combining Posterior Instrumentation and its Surgical Outcomes

Introduction: Anterior sacroiliac joint (SIJ) fusion has been performed for severe SIJ disorders and has demonstrated stable long-term outcomes; however, its relatively high invasiveness remains a significant concern. To overcome this limitation, we developed a posterior fusion using transarticular cylindrical cages combined with posterior instrumentation. This study describes the posterior SIJ fusion technique and evaluates the surgical outcomes.