Figure 5From: Biomechanical comparison of different combinations of hook and screw in one spine motion unit - an experiment in porcine model The spinal constructs after the pullout tests. (a) Spinal construct with pedicle screw instrumentations. The screws were pulled out without failure of the spinal construct. (b) Spinal construct with a combination of pedicle screws and lamina hooks. The spinal construct failed due to lamina fracture.Back to article page