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Updated: Mar 17, 2026

An Anesthesia, Surgery, and Harvest Method for the Evaluation of Transpedicular Screws Using an In Vivo Porcine Lumbar Spine Model
Published on: May 31, 2017
Effect of screw position on load transfer in lumbar pedicle screws: a non-idealized finite element analysis
Anna G U S Newcomb1, Seungwon Baek1, Brian P Kelly1
1a Spinal Biomechanics Laboratory, Department of Neurosurgery Research , Barrow Neurological Institute, St. Joseph's Hospital and Medical Center , Phoenix , AZ , USA.
Abstract:
Angled screw insertion has been advocated to enhance fixation strength during posterior spine fixation. Stresses on a pedicle screw and surrounding vertebral bone with different screw angles were studied by finite element analysis during simulated multidirectional loading. Correlations between screw-specific vertebral geometric parameters and stresses were studied. Angulations in both the sagittal and axial planes affected stresses on the cortical and cancellous bones and the screw. Pedicle screws pointing laterally (vs. straight or medially) in the axial plane during superior screw angulation may be advantageous in terms of reducing the risk of both screw loosening and screw breakage.
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