title: [Analysis of the four parameter linear viscoelastic model on prosthetic nucleus and the influence of manufacture on parameters of this model].
abstract: The purpose of this study is to characterize the stress relax properties of PVA-H prosthetic nucleus via the four-parameter linear viscoelastic model and to analyze the influence of swelling ratio and initial PVA content upon the properties of dissipating compressive stress. The four-parameter linear viscoelastic model can simulate the viscoelastic property of prosthetic nucleus well (corr > 0.99) and be more effective than the three parameter linear viscoelastic model. From the parameters of this model we have obtained the following results: the prosthetic nucleus of higher water content can dissipate compressive stress more quickly than that of lower water content can do, but the quantity of stress relax can not be influenced by water content; the higher the initial PVA content,the slower and smaller the dissipation of compressive stress;the relax time of prosthetic nucleus is similar to that of human nucleus.
authors.affiliation: School of Materials Science and Engineering, Beijing University of Science and Technology, Beijing 100083 China.
authors.forename: Bing
authors.initials: B
authors.lastname: Ji
authors.forename: Jin
authors.initials: J
authors.lastname: Gao
authors.forename: Yuanzheng
authors.initials: Y
authors.lastname: Ma
authors.forename: Zhengqiu
authors.initials: Z
authors.lastname: Gu
authors.forename: Guoquan
authors.initials: G
authors.lastname: Liu
authors.forename: Haibin
authors.initials: H
authors.lastname: Xue
mesh_terms: D019245:Compressive Strength; D004548:Elasticity; D007403:Intervertebral Disc / Q000502:physiology*; D016014:Linear Models; D008954:Models, Biological; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D019736:Prostheses and Implants; D014783:Viscosity; D016474:Weight-Bearing / Q000502:physiology
chemical_list: C062364:polyvinyl alcohol hydrogel; D011142:Polyvinyl Alcohol