A Novel Spine Fixation System Made Entirely of Carbon-Fiber-Reinforced PEEK Composite: An In Vitro Mechanical Evaluation

Table 3

Static torsion test results of the CarboClear system.

Sample	Yield torque (Nm)	Torsional stiffness (Nm/deg)	Angular displacement at 2% offset yield (deg)	Elastic angular displacement (deg)
1	12.4	0.9	16.1	14.2
2	10.4	1.1	11.1	9.2
3	12.4	1.2	12.4	10.2
4	15.1	0.9	18.3	16.2
Mean ± SD	12.6 ± 1.9	1.0 ± 0.1	14.4 ± 3.3	12.4 ± 3.3