Figure 5

Comparison of the force (a) and number of cycles (b) required to achieve a 1, 2, 3, 4, and 5 mm displacement of the locking screws (LP fixation) with square thread and triangle thread under cyclic craniocaudal loading. Mean values ± standard deviation of the measured values are presented (N = 5) (Student’s t-test, *p < 0.05, **p < 0.01).