The Multi-Thread Iliac Screw represents a novel way to embed fasteners in the ilium by improving fixation of said fasteners in the different parts of the iliac bone tissue. The screw consists of a saddle with a locking screw and fastener with three types of threads to provide a more mechanically stable embedding of the fastener in the iliac bone. The saddle receives a spinal stabilizing rod, which is part of another vertebral mechanical system, and, as such, the saddle provides an anchor point to the stabilizing rod. In another embodiment, the saddle is designed with an integrated rod on its side, which mates to another hollow rod integrated to a cube-shaped connector, thereby replacing the stabilizing rod. The connector provides the interface to the rest of the vertebral mechanical system.