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Table 2 Torque and pullout strength

From: Biomechanical testing of a unique built-in expandable anterior spinal internal fixation system

 

Common screw (n = 6)

Expandable device unexpanded (n = 6)

Expandable device expanded (n = 6)

p

Maximum insertion torque (Ns)

3.75 (0.69)

4.50 (0.56)

5.10 (0.83)*

.016

Maximum pullout strength (N)

1,827.38 (260.38)

2,333.49 (310.14)*

3,035.48 (252.04)*†

<0.001

  1. Data are presented by mean and standard deviation.
  2. *Indicates a significant difference compared to common screw group.
  3. †Indicates a significant difference compared to the anterior fixation screw unexpanded group.
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