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Table 2 Screw’s group-specific mean pull-out forces in consideration of the testing conditions

From: Comparison of three different screw trajectories in osteoporotic vertebrae: a biomechanical investigation

 

Pull-out force in N

 

Group A

 

Group B

 

CBT

MC

p

TT

MC

p

Static test

 Total

587.9 ± 309.1

603.8 ± 227.7

0.327

986.8 ± 302.7

691.0 ± 375.2

0.063

 L2

581.3 ± 307.7

649.2 ± 266.4

0.345

1003.5 ± 341.4

559.7 ± 382.6

0.068

 L4

594.5 ± 310.4

528.2 ± 104.1

0.593

964.6 ± 239.9

855.1 ± 292.1

1000

Dynamic test

 Total

401.2 ± 261.4

449.4 ± 298.9

0.068

990.2 ± 451.9

714.5 ± 488.0

0.499

 L1

424.7 ± 349.5

339.1 ± 285.9

0.180

1193.0 ± 311.7

928.5 ± 579.3

0.465

 L3

377.8 ± 115.6

633.2 ± 219.1

0.180

736.8 ± 471.7

500.4 ± 221.4

0.593

 L5

1637.9 ± 222.8

960.2 ± 141.5

0.109

  1. Static test: pull-out; Dynamic test: fatigue testing + pull-out