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Figure 3 | Scoliosis

Figure 3

From: Axial pullout strength comparison of different screw designs: fenestrated screw, dual outer diameter screw and standard pedicle screw

Figure 3

Test fixture for screw pullout test. A) Adapter (gripping the pedicle screw head) used for pulling out the screw; B) U-clamps hold the specimen in place while allowing rotation of the specimen to align the pedicle to be placed directly in line with the adapter for true axial pullout;C) Additional fixation was applied to the lamina (after pedicle screw were inserted and oriented perpendicular to the load cell) to prevent rotation of the specimen during pullout testing; D) Load cell of the MTS machine to which the fixture was attached; E) Slot that allows for translation in the X-Y direction to perform pullout testing on the left and right side.

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Scoliosis and Spinal Disorders

ISSN: 2397-1789

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