Document Detail


Cervical ossification of the posterior longitudinal ligament: Biomechanical analysis of the influence of static and dynamic factors.
MedLine Citation:
PMID:  24964955     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Objective Cervical myelopathy due to ossification of the posterior longitudinal ligament (OPLL) is induced by static factors, dynamic factors, or a combination of both. We used a three-dimensional finite element method (3D-FEM) to analyze the stress distributions in the cervical spinal cord under static compression, dynamic compression, or a combination of both in the context of OPLL. Methods Experimental conditions were established for the 3D-FEM spinal cord, lamina, and hill-shaped OPLL. To simulate static compression of the spinal cord, anterior compression at 10, 20, and 30% of the anterior-posterior diameter of the spinal cord was applied by the OPLL. To simulate dynamic compression, the OPLL was rotated 5°, 10°, and 15° in the flexion direction. To simulate combined static and dynamic compression under 10 and 20% anterior static compression, the OPLL was rotated 5°, 10°, and 15° in the flexion direction. Results The stress distribution in the spinal cord increased following static and dynamic compression by cervical OPLL. However, the stress distribution did not increase throughout the entire spinal cord. For combined static and dynamic compression, the stress distribution increased as the static compression increased, even for a mild range of motion (ROM). Conclusion Symptoms may appear under static or dynamic compression only. However, under static compression, the stress distribution increases with the ROM of the responsible level and this makes it very likely that symptoms will worsen. We conclude that cervical OPLL myelopathy is induced by static factors, dynamic factors, and a combination of both.
Authors:
Norihiro Nishida; Tsukasa Kanchiku; Yoshihiko Kato; Yasuaki Imajo; Yuichiro Yoshida; Syunichi Kawano; Toshihiko Taguchi
Related Documents :
20454135 - Considerations in building a low-noise reflection absorption infrared spectrometer.
23214745 - Current fluctuations in the weakly asymmetric exclusion process with open boundaries.
23079135 - Comparison of four different particle sizing methods for sirna polyplex characterization.
11541745 - Infrared laser spectroscopy of jet-cooled carbon clusters: the nu 5 band of linear c9.
11863525 - Phase diagram and physical properties of a waterless sodium bis(2-ethylhexylsulfosuccin...
24328385 - Size dependence of negative trion auger recombination in photodoped cdse nanocrystals.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-6-25
Journal Detail:
Title:  The journal of spinal cord medicine     Volume:  -     ISSN:  1079-0268     ISO Abbreviation:  J Spinal Cord Med     Publication Date:  2014 Jun 
Date Detail:
Created Date:  2014-6-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9504452     Medline TA:  J Spinal Cord Med     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

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


Previous Document:  SHERPA: an image segmentation and outline feature extraction tool for diatoms and other objects.
Next Document:  Pseudomonas aeruginosa isolates in severe chronic obstructive pulmonary disease: characterization an...