An implant (fixture) device, systems, and methods for providing a fixture in, and/or around, and/or on, a substrate such a bone. The implant includes a hollow body composed of a shape-memory material. The hollow body includes a plurality of sections connected to each other and separated by an opening between the sections. The plurality of sections are configured to have a compact configuration and/or an expanded configuration and may change between the first configuration and the second configuration in response to an applied stimulus. The opening and the plurality of sections may be in the shape of a spiral.
