Low back pain (LBP) is a leading cause of disability worldwide and affects the quality of life and mechanical function of millions globally. Epidemiological studies suggest that as many as 30% individuals with low back pain may have underlying etiologies of the sacroiliac (SI) joint. Despite the relative prevalence of SI pain, interventional SI treatments are not currently standardized. Corticosteroid injection and radiofrequency ablation appear to improve SI pain but lack durability; very low quality evidence exists to suggest that platelet-rich plasma (PRP) injections temporarily alleviate SI pain symptoms. Individuals whose SI pain is refractory to conservative management or percutaneous interventions may be candidates for surgical fusion of the SI joint. However, the national prevalence of SI joint fusion surgeries and specific demographic and comorbid indications for the procedure are largely unknown. This work seeks to leverage the National Inpatient Sample (NIS) and National Surgical Quality Improvement Program (NSQIP) databases to catalogue and describe the prevalence of SI joint fusion, potential heterogeneity in surgical approaches, and prognostic factors associated with short- and long-term positive outcomes.