Cortical bone trajectory screws in the treatment of lumbar degenerative disc disease in patients with osteoporosis

Figure 1 Comparison of the cortical bone trajectory screw with the traditional pedicle screw trajectory. A: Axial view; B: Lateral view; C: Anteroposterior view.

Figure 2 Implantation of the cortical bone trajectory screw assisted by the navigation system. A: Feeling the entry point of the cortical bone trajectory (CBT) screw in L4 with the assistance of the navigation system; B: Awl of the CBT screw in L4 with the assistance of the navigation system; C: Tapping of the CBT screw in L4 with the assistance of the navigation system; D: Fluoroscopy showed the placement of CBT screws during the surgery; E: X-ray showed the implantation of CBT screws after surgery.