A novel bone cement injector augments Chinese osteoporotic lumbar pedicle screw channel: a biomechanical investigation

Table 1 The maximum insertion torque and axial pull-out force

Parameters	Number of lateral holes					P ¹
Parameters	4 holes	6 holes	8 holes	straight pore	control	P ¹
Maximum insertion torque (N·m)	0.12 ± 0.01	0.12 ± 0.02	0.11 ± 0.01	0.11 ± 0.01	0.07 ± 0.01²	< 0.01
Maximum axial pull-out strength (N)	217.29 ± 49.68	228.39 ± 57.83	161.35 ± 27.17³	237.55 ± 35.96	40.37 ± 8.9⁴	< 0.01

Note: 1 indicates the P-value was obtained from the analysis of variance; 2 indicates statistical significance as compared to the other four groups according to the SNK-q test; 3 indicates statistical significance as compared to the other four groups according to the SNK-q test; 4 indicates statistical significance as compared to the other four groups according to the SNK-q test

ISSN: 1471-2474