Fig. 3

Female, 73-year-old, T = − 3.5 SD, the patient underwent solid pedicle screw with a pre-augmented trajectory a. The preoperative x-ray image showed lumbar vertebral degeneration and no fracture was found in the L2 vertebral; b. Postoperative x-ray: L2 vertebral fracture; c: when a screw was implanted late and the cement becomes solidified, the screw may deviate augmented trajectory, and the following rupture of the cortex bone may result in vertebral fracture; d. Three years after the operation, the x-ray showed that L2 vertebral body collapsed, the fracture healed and the L2 pedicle screw has not loosened