Arx^®
The Arx® is a top-loading thoracolumbar pedicle screw system offering a massive 80° of screw angulation. The Arx head design has both a slim shape and low profile while still maintaining extremely high strength characteristics. The head also embodies several novel mechanisms; one that both prevents cap cross threading and another that allows the surgeon to concertedly freeze the screw orientation while compression and distraction are accomplished. The Arx features cannulated MIS self-tapping and self-threading screws that are color coded and available in sizes 4.5mm to 8.5mm in a variety of standard lengths. The Arx system currently accepts 5.5mm rods with 6.35mm forthcoming.