A threaded implant includes a body, exterior surface, interior surface, fenestrations, and threads. The body may be a hollow tubular structure. Alternatively, the body may be solid and cannulated. The surface of the threaded implant may have mesh configuration, beaded configuration, trabecular configuration, holes or any surface conducive to bony in-growth, on-growth and/or through-growth. The threads may be barbed and may allow for easy insertion through the bone. The threaded implant may be tapped into place. A method for fusing bone may involve inserting the implant laterally through the ilium, through the sacral-iliac joint, and into the sacrum.
