Document Detail

Modeling of facet articulation as a nonlinear moving contact problem: sensitivity study on lumbar facet response.
MedLine Citation:
PMID:  9675690     Owner:  NLM     Status:  MEDLINE    
A finite element (FE) based scheme for modeling facet articulation in a spinal motion segment is proposed. The algorithm presented models the facet articulation as a nonlinear progressive contact problem. This algorithm is used to perform a nonlinear FE analysis of a complete L3-L4 motion segment. The role of facets in load transmission through a motion segment and its sensitivity to facet geometric parameters (i.e., spatial orientation of the facets and the gap between the facet articular surfaces) on this load transmission are studied. Compression, flexion, extension, and torsion loads are used in this study. The effect of facetectomy on gross segment response and disk fiber strains is studied by comparing the response of FE models of motion segment with and without facets. Large facet loads are obtained when the motion segment is subjected to torsional and large extension rotations, whereas minimal facet loads are observed under compression and flexion loading. Removal of facets reduces the segment stiffness considerably in torsion and results in higher strain levels in disk fibers. The facet load transmission is sensitive to facet geometric parameters, i.e., spatial orientation and initial facet joint gap. The facet loads increase uniformly with decrease in initial gap between the facet articular surfaces under compression, extension, and torsional loads. The sensitivity to spatial orientation angles of the facet is, however, found to vary with the type of loading. This sensitivity may account for the wide variation in the facet response reported in literature.
M Sharma; N A Langrana; J Rodriguez
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of biomechanical engineering     Volume:  120     ISSN:  0148-0731     ISO Abbreviation:  J Biomech Eng     Publication Date:  1998 Feb 
Date Detail:
Created Date:  1998-10-28     Completed Date:  1998-10-28     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7909584     Medline TA:  J Biomech Eng     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  118-25     Citation Subset:  IM; S    
Department of Mechanical and Aerospace Engineering, Rutgers, State University of New Jersey, New Brunswick 08903, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Computer Graphics
Computer Simulation*
Image Processing, Computer-Assisted
Lumbar Vertebrae / physiology*
Models, Theoretical
Range of Motion, Articular / physiology*
Weight-Bearing / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Micromechanics of osteonal cortical bone fracture.
Next Document:  The influence of strain rate on the passive and stimulated engineering stress--large strain behavior...