Fig. 4From: The positional consistency between guidewire and cannulated or solid screw in robot-assisted spinal internal fixation surgeryExamples of low grade cases with respect to the consistency between guidewire and screw. Figure shows the low consistency grade cases in each group with respect to the consistency between guidewire and screw. A: Solid screws; B: Cannulated screws. Solid screws can alter their trajectory considerably without the guidance of guidewireBack to article page