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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.