Document Detail


The multidirectional bending properties of the human lumbar intervertebral disc.
MedLine Citation:
PMID:  16651218     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND CONTEXT: While the biomechanical properties of the isolated intervertebral disc have been well studied in the three principal anatomic directions of flexion/extension, axial rotation, and lateral bending, there is little data on the properties in the more functional directions that are combinations of these principal anatomic directions. PURPOSE: To determine the bending flexibility, range of motion (ROM), and neutral zone (NZ) of the human lumbar disc in multiple directions and to determine if the values about the combined moment axes can be predicted from the values about principal moment axes. STUDY DESIGN/SETTING: Three-dimensional biomechanical analysis of the elastic bending properties of human lumbar discs about principal and combined moment axes. METHODS: Pure, unconstrained moments were applied about multiple axes. The bending properties (flexibility, ROM, and NZ) of isolated lumbar discs (n=4 for L2/L3 and n=3 for L4/L5) were determined in the six principal directions and in 20 combined directions. The experimental values were compared with those predicted from the linear combination of the six principal moment axes. RESULTS: The maximum and minimum values of the biomechanical properties were found at the principal moment axes. Among combined moment axes, ROM and NZ (but not flexibility) values were predicted from the principal moment axis values. CONCLUSIONS: The principal moment axes coincide with the primary mechanical axes of the intervertebral disc and demonstrate significant differences in direction for values of flexibility, ROM, and NZ. Not all combined moment axis values can be predicted from principal moment axis values.
Authors:
David Spenciner; David Greene; James Paiva; Mark Palumbo; Joseph Crisco
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The spine journal : official journal of the North American Spine Society     Volume:  6     ISSN:  1529-9430     ISO Abbreviation:  Spine J     Publication Date:    2006 May-Jun
Date Detail:
Created Date:  2006-05-02     Completed Date:  2006-07-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  101130732     Medline TA:  Spine J     Country:  United States    
Other Details:
Languages:  eng     Pagination:  248-57     Citation Subset:  IM    
Affiliation:
Department of Orthopaedics, Brown Medical School/Rhode Island Hospital, Providence, RI 02903, USA.
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MeSH Terms
Descriptor/Qualifier:
Humans
Intervertebral Disk / physiology*
Lumbar Vertebrae / physiology*
Middle Aged
Pliability*
Range of Motion, Articular*

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


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