Journal of Spine

Daniel K. Palmer

Publications

• Research Article
  Pullout Strength Of Anterior Lumbar Interbody Fusion Plates: Fixed Versus Variable Angle Screw Designs
  Author(s): Wayne K. Cheng, Zachary S. Hadley, Daniel K. Palmer and Paul A. WilliamsWayne K. Cheng, Zachary S. Hadley, Daniel K. Palmer and Paul A. Williams
  
  Abstract Purpose: To compare the pullout loads of variable versus fixed angle screws in anterior lumbar interbody fusion (ALIF) plate/screw constructs in both foam and cadaveric models. Methods: An ALIF plate was secured to a 0.160 g/cm3 polyurethane foam block (N = 10) with fixed or equivalently positioned variable angle screws and pulled out at 1 mm/min to failure. Embalmed human vertebral pairs (N = 10) were similarly utilized to compare fixed versus variable angle plate/screw constructs for pullout strength. Results: There was no statistically significant difference between fixed and variable angle plates for either foam (p = 0.6) or vertebral specimens (p = 0.3) based on maximum load or stiffness. The maximum load for the vertebral specimens was on average 39% of that for the foam (p = 0.001).. Read More»
  DOI: 10.4172/2165-7939.1000118

  Abstract PDF