Design iFuse-3D is a minimally invasive implant system intended to stabilize and fuse the sacroiliac joint by delivering triangular, porous, fenestrated titanium implants across the joint via a percutaneous approach. Key features The implant is specifically designed to stabilize and fuse the SI joint. Titanium construction provides an interference fit between the implant and the adjacent osseous walls. Triangular-shaped implant profile minimizes rotation, with more than 6× the rotational resistance of a screw, and stabilizes the joint while the porous surface supports long-term fusion. 3D-printed trabecular surface mimics native cancellous bone and enhances osteointegration; implant surface porosity is approximately 65 percent and pore size is approximately 300 micrometers, compared with cancellous bone porosity of approximately 60–70 percent and pore size approximately 200–400 micrometers. Designed to allow ongrowth, ingrowth, and through-growth; animal data include a sheep study at 12 weeks post-implantation. Self-Harvesting Technology captures bone during implantation. Fenestrated structure may be pre-packed with autograft or allograft, approximately 1–3 cc depending on implant size. Indications Intended for sacroiliac joint fusion. Clinicians should review manufacturer risk information and patient selection guidance. Approach Minimally invasive lateral or oblique trajectory through a small incision with percutaneous instrumentation to place triangular implants across the SI joint. Technique Plan trajectory under fluoroscopic guidance. Advance the guide pin with fluoroscopic confirmation of position and depth. Maintain the working corridor and protect soft tissues. Confirm working length relative to planned implant size. Create the pilot channel along the guide pin with fluoroscopic confirmation. Prepare the triangular channel to achieve an interference fit. Advance until seated; confirm final position with fluoroscopy. Place additional implants per preoperative plan. Technical specifications Triangular profile with interference-fit geometry Outer diameter 14.2 mm Inner diameter 8.5 mm Height of triangular profile 11.35 mm Implant lengths 35–90 mm in 5 mm increments Graft volume range approximately 1.2–3.4 cc depending on implant length Additive manufactured porous surface Porosity approximately 65 percent Pore size approximately 300 micrometers Fenestrations support packing with autograft or allograft and facilitate through-growth Screws Triangular implants differ from cylindrical screws by engaging osseous walls with an interference fit that improves rotational stability for SI fixation. The geometry demonstrates more than sixfold rotational resistance compared with a screw. Porous, fenestrated architecture supports ongrowth, ingrowth, and through-growth to complement mechanical stability. References