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Development of a Biomechanical Model Producing Proximal Pedicle Pullout of Long Fusion Spinal Constructs

[+] Author Affiliations
Audrey Martin, Peter Wanberg, Jenni Buckley

The Taylor Collaboration Laboratories, San Francisco, CA

Jeremi Leasure

The Taylor Collaboration Laboratories, San Francisco, CASan Francisco Orthopaedic Residency Program, San Francisco, CA

Dimitriy Kondrashov

St. Mary’s Spine Center, San Francisco, CAUniversity of California, San Francisco, San Francisco, CA

Christopher Ames

University of California, San Francisco, San Francisco, CA

Paper No. SBC2013-14189, pp. V01AT09A004; 2 pages
  • ASME 2013 Summer Bioengineering Conference
  • Volume 1A: Abdominal Aortic Aneurysms; Active and Reactive Soft Matter; Atherosclerosis; BioFluid Mechanics; Education; Biotransport Phenomena; Bone, Joint and Spine Mechanics; Brain Injury; Cardiac Mechanics; Cardiovascular Devices, Fluids and Imaging; Cartilage and Disc Mechanics; Cell and Tissue Engineering; Cerebral Aneurysms; Computational Biofluid Dynamics; Device Design, Human Dynamics, and Rehabilitation; Drug Delivery and Disease Treatment; Engineered Cellular Environments
  • Sunriver, Oregon, USA, June 26–29, 2013
  • Conference Sponsors: Bioengineering Division
  • ISBN: 978-0-7918-5560-7
  • Copyright © 2013 by ASME


Proximal pedicle screw pullout is a common clinical occurrence for long fusion constructs. Recently, novel spinal hardware and surgical techniques have been in development to alleviate this complication [1]. However, there is currently no biomechanical model to simulate this mode of failure in vitro to adequately evaluate these strategies in a rigorous laboratory setting. Standard pure moment loading and range of motion testing are not equipped to reproduce this failure modality [2] and a vast majority of such outcomes have merely been observed clinically [3]. It is hypothesized that a combination of anterior-posterior (AP) shear and compressive force is required to induce screw pullout with clinically similar fatigue patterns. The goal of this preliminary study is the development of such a biomechanical model to simulate clinically observed proximal pedicle screw failure.

Copyright © 2013 by ASME
Topics: Biomechanics



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