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Deformation of the corona radiata and internal capsule in normal pressure hydrocephalus.
MedLine Citation:
PMID:  25239382     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND AND PURPOSE: The pathophysiology of the clinical manifestations in normal pressure hydrocephalus (NPH) remains obscure. Ventricular dilatation could generate forces on the paracentral fibers of the corona radiata (CR), hence interfering with their function and producing the classical clinical triad. The analysis of the regional displacement and deformation of the white matter bundles, forming the corona radiata and internal capsule, may clarify the relationship between ventricular dilatation and clinical manifestations in NPH.
METHOD: An experimental finite element (FE) analysis was used to simulate ventricular dilatation in 3 dimensions (3D) and to calculate the strain and deformation on the surrounding parenchyma. Magnetic resonance diffusion tensor imaging-based white matter tractography was then applied to retrieve the displacement and deformation exerted along various fiber bundles of the corona radiata and internal capsule. Anterior and posterior limb displacements and elongations were compared using a paired samples t-test.
RESULTS: The internal capsule, hence the corona radiata, of each cerebral hemisphere was segmented into anterior and posterior limbs. Mean displacements and elongations were calculated for each limb. Mean displacement was significantly larger in the anterior limb whereas mean deformation was larger in the posterior limb (P<0.01).
CONCLUSION: The present simulation demonstrates that ventricular dilatation does not have a homogeneous effect on the periventricular fibre tracts, with a particular load on the corticospinal tract. The affection of this tract remains thereby a potential factor in the generation of the NPH gait disorders.
Authors:
A Rogers; D Bichsel; S Momjian
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-9-16
Journal Detail:
Title:  Neuro-Chirurgie     Volume:  -     ISSN:  0028-3770     ISO Abbreviation:  Neurochirurgie     Publication Date:  2014 Sep 
Date Detail:
Created Date:  2014-9-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401057     Medline TA:  Neurochirurgie     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2014 Elsevier Masson SAS. All rights reserved.
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