Fig. 3From: Effect of different inner core diameters on structural strength of cannulated pedicle screws under various lumbar spine movementsFour screw types were analyzed in this analysis: a a solid screw (S0); b a screw combining with 1.5 mm cannulated core path (S1.5); c a screw combining with 2.0 mm cannulated core path (S2.0); d a screw combining with 2.5 mm cannulated core path (S2.5)Back to article page