In-vitro comparison of the pullout strength of 3 different thoracic screw fixation techniques

Journal of Spinal Disorders & Techniques
Sebastian FürdererPeer Eysel

Abstract

Dvorak et al in 1993 and Husted et al in 2003 reported 2 different screw fixation techniques at the thoracic spine as alternatives to transpedicular screws. So far, there is no investigation comparing the pullout stability of all 3 possible screw fixation techniques. To evaluate the stability of possible alternatives for transpedicular screw fixation. A biomechanical human cadaver investigation of the transpedicular and 2 different extrapedicular techniques was performed in the form of a comparative pullout test. Eighteen human vertebral bodies from Th7 to Th9 were harvested from 6 donors, dissected from surrounding tissue, and matched to 3 different fixation groups. As alternatives for transpedicular screw fixation, an extrapedicular supratransverse screw insertion from posterolateral and a tricortical screw fixation technique, penetrating the transverse process and reentering the vertebral body at the pedicle base were evaluated biomechanically. A unilateral screw fixation was performed in one of the described techniques. Axial pullout strength was measured using a Zwick Z50 servoelectric testing machine. The average pullout strength of the pedicle screws was 400 N, whereas the supratransverse and the pertransverse screw fixa...Continue Reading

Citations

Jan 13, 2016·The International Journal of Medical Robotics + Computer Assisted Surgery : MRCAS·Jang W YoonStephen M Pirris
May 6, 2015·The International Journal of Medical Robotics + Computer Assisted Surgery : MRCAS·Stephen M PirrisMark Pichelmann
May 20, 2020·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Haruo KannoEiji Itoi

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