The 5.5mm spinal pedicle screw system is an orthopedic implant used for spinal fusion surgery, providing stability and fixation of spinal segments. The 5.5mm spinal implant system is usually made of medical grade titanium or titanium alloy. Titanium materials have the characteristics of being sturdy, lightweight, and biocompatible. When placed in the body, they will not cause adverse reactions. Screws can also have coatings or surface treatments to promote bone growth and fusion around the screw.