Biomechanical analysis of pedicle screw density in spinal instrumentation for scoliosis treatment: First results

Xiaoyu Wang, Carl Eric Aubin, A. Noelle Larson, Hubert Labelle, Stefan Parent

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations

Abstract

Clinical studies reveal remarkable variation in screw patterns, or screw density in spinal instrumentation. Screw density may have a great impact on blood loss, operative time, radiation, risk of screw malposition, and cost. Thus, there is a need to understanding of the biomechanical effects of screw density so as to minimize the number of pedicle screws while ensuring safe and effective instrumentation. The objective of this study was to compare the deformity correction effects and bone-screw loadings of different pedicle screw densities in spinal instrumentation for scoliosis treatment. Spinal instrumentation simulations were performed on three scoliosis patients using 3 screw density patterns (low, preferred, and high screw density) proposed by two experienced surgeons and basic correction techniques: concave rod attachment, rod derotation, apical vertebral derotation, and convex side rod attachment. Simulation results showed that all tested screw densities generated quite similar correction, with differences between the achieved corrections all below 3°. The average bone-screw forces were 244±67N, 214±66 N, and 210±71 N, respectively for low, preferred, and high densities. It remains a complex challenge balancing the benefit of load sharing between more implants with the overconstraints and limited degrees of freedom introduced by the increased number of implants. Studies on additional screw densities and patterns proposed by more surgeons for a variety of cases, and using more diverse correction techniques are necessary to draw stronger conclusions and to recommend the optimal screw density.

Original languageEnglish (US)
Title of host publicationResearch into Spinal Deformities 8
PublisherIOS Press
Pages303-306
Number of pages4
ISBN (Print)9781614990666
DOIs
StatePublished - Jan 1 2012
Event9th Biennial Meeting of the International Research Society of Spinal Deformities, IRSSD 2012 - Poznan, Poland
Duration: Jul 1 2012Jul 4 2012

Publication series

NameStudies in Health Technology and Informatics
Volume176
ISSN (Print)0926-9630
ISSN (Electronic)1879-8365

Other

Other9th Biennial Meeting of the International Research Society of Spinal Deformities, IRSSD 2012
CountryPoland
CityPoznan
Period7/1/127/4/12

Keywords

  • Biomechanical model
  • Instrumentation
  • Pedicle screw
  • Scoliosis
  • Spine

ASJC Scopus subject areas

  • Biomedical Engineering
  • Health Informatics
  • Health Information Management

Fingerprint Dive into the research topics of 'Biomechanical analysis of pedicle screw density in spinal instrumentation for scoliosis treatment: First results'. Together they form a unique fingerprint.

  • Cite this

    Wang, X., Aubin, C. E., Larson, A. N., Labelle, H., & Parent, S. (2012). Biomechanical analysis of pedicle screw density in spinal instrumentation for scoliosis treatment: First results. In Research into Spinal Deformities 8 (pp. 303-306). (Studies in Health Technology and Informatics; Vol. 176). IOS Press. https://doi.org/10.3233/978-1-61499-067-3-303