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    
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.
Norihiro Nishida; Tsukasa Kanchiku; Yoshihiko Kato; Yasuaki Imajo; Yuichiro Yoshida; Syunichi Kawano; Toshihiko Taguchi
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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:  -    
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