A sacroiliac (“SI”) joint fastener apparatus, systems, and methods of using the device is described. The SI joint fastener apparatus can include a distal segment, a proximal segment, and an expandable portion. The expandable portion can be expanded by reducing the distance between the distal and proximal segments. The SI joint fastener apparatus can be used to fuse two bone portions together. The method can include steps of coupling the fastener apparatus to two bone portions, reducing the distance between the two bone portions to place the portions in compression, and applying an outwardly directed force proximate the location to be fused.
