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Tribology of flexible and sliding spinal implants: development of experimental and numerical models

Le Cann, Sophie LU ; Chaves-Jacob, Julien; Rossi, Jean-Marie; Linares, Jean-Marc and Chabrand, Patrick (2016) In Journal of Biomedical Materials Research - Part B Applied Biomaterials
Abstract
New fusionless devices are being developed to get over the limits of actual spinal surgical treatment, based on arthrodesis. However, due to their recentness, no standards exist to test and validate those devices, especially concerning the wear. A new tribological first approach to the definition of an in vitro wear protocol to study wear of flexible and sliding spinal devices is presented in this article, and was applied to a new concept. A simplified synthetic spine portion (polyethylene) was developed to reproduce a simple supra-physiological spinal flexion (10° between two vertebrae). The device studied with this protocol was tested in wet environment until 1 million cycles (Mc). We obtained an encouraging estimated wear volume of same... (More)
New fusionless devices are being developed to get over the limits of actual spinal surgical treatment, based on arthrodesis. However, due to their recentness, no standards exist to test and validate those devices, especially concerning the wear. A new tribological first approach to the definition of an in vitro wear protocol to study wear of flexible and sliding spinal devices is presented in this article, and was applied to a new concept. A simplified synthetic spine portion (polyethylene) was developed to reproduce a simple supra-physiological spinal flexion (10° between two vertebrae). The device studied with this protocol was tested in wet environment until 1 million cycles (Mc). We obtained an encouraging estimated wear volume of same order of magnitude compared to similar devices. An associated finite element (FE) numerical model has permitted to access contact information and study the effect of misalignment of one screw. First results could point out how to improve the design and suggest that a vertical misalignment of a screw (under or over-screwing) has more impact than a horizontal one. (Less)
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author
publishing date
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Contribution to journal
publication status
published
subject
in
Journal of Biomedical Materials Research - Part B Applied Biomaterials
publisher
John Wiley & Sons
external identifiers
  • scopus:85006051824
ISSN
1552-4981
DOI
10.1002/jbm.b.33819
language
English
LU publication?
no
id
34c34d68-2db9-49af-aab4-d6935396d953
date added to LUP
2017-02-15 10:42:10
date last changed
2017-03-10 13:20:44
@article{34c34d68-2db9-49af-aab4-d6935396d953,
  abstract     = {New fusionless devices are being developed to get over the limits of actual spinal surgical treatment, based on arthrodesis. However, due to their recentness, no standards exist to test and validate those devices, especially concerning the wear. A new tribological first approach to the definition of an in vitro wear protocol to study wear of flexible and sliding spinal devices is presented in this article, and was applied to a new concept. A simplified synthetic spine portion (polyethylene) was developed to reproduce a simple supra-physiological spinal flexion (10° between two vertebrae). The device studied with this protocol was tested in wet environment until 1 million cycles (Mc). We obtained an encouraging estimated wear volume of same order of magnitude compared to similar devices. An associated finite element (FE) numerical model has permitted to access contact information and study the effect of misalignment of one screw. First results could point out how to improve the design and suggest that a vertical misalignment of a screw (under or over-screwing) has more impact than a horizontal one.},
  author       = {Le Cann, Sophie and Chaves-Jacob, Julien and Rossi, Jean-Marie and Linares, Jean-Marc and Chabrand, Patrick},
  issn         = {1552-4981},
  language     = {eng},
  month        = {11},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Biomedical Materials Research - Part B Applied Biomaterials},
  title        = {Tribology of flexible and sliding spinal implants: development of experimental and numerical models},
  url          = {http://dx.doi.org/10.1002/jbm.b.33819},
  year         = {2016},
}