Lumbar interbody fusion: A parametric investigation of a novel cage design with and without posterior instrumentation

Fabio Galbusera, Hendrik Schmidt, Hans Joachim Wilke

Research output: Contribution to journalArticle

Abstract

Introduction A finite element model of the L4-L5 human segment was employed to carry out a parametric biomechanical investigation of lumbar interbody fusion with a novel ''sandwich'' cage having an inner stiff core and two softer layers in the areas close to the endplates, with and without posterior fixation. Methods Considered cage designs included: (a) cage in a homogeneous material with variable elastic modulus (19-2,000 MPa), (b) ''sandwich'' cage having an inner core (E = 2,000 MPa) and softer layers (E = 19 MPa) with variable thickness (1-2.5 mm). The latter cage was also considered in combination with posterior rods made with a material having variable elastic modulus (19-210,000 MPa). All the models were loaded with 500 N compression and moments of 7.5 Nm in flexion, extension, lateral bending and axial rotation. Results The homogeneous cage stabilized the segment in flexion, lateral bending and axial rotation; in extension there was a destabilization up to 60% and remarkable cage movement (1 mm). The ''sandwich'' cage limited this phenomenon (cagemovement

Original languageEnglish
Pages (from-to)455-462
Number of pages8
JournalEuropean Spine Journal
Volume21
Issue number3
DOIs
Publication statusPublished - Mar 2012

Keywords

  • Cage
  • Flexible rods
  • Interbody fusion
  • Sandwich cage
  • Spine stabilization

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

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