The SI-Restore® Sacroiliac Joint Fixation System consists of a cannulated titanium (Ti 6Al4V ELI, per ATSM F136) screw with a titanium (Ti 6Al4V ELI, per ATSM F136) washer affixed to the head of the screw for full cortex engagement. The implant is designed to prevent motion of the sacroiliac (SI) joint. The delivery system uses guide pins for accurate preparation and placement of the implant.