Bulging intervertebral disc:an asymptotic elasticity solution

作     者：Yu-Cheng Lo Liu Wang 

作者机构：Orthopaedic DepartmentChanghua Christian HospitalChanghuaChina Department of Aerospace Engineering and EngineeringMechanicsCenter for Mechanics of SolidsStructures andMaterialsUniversity of Texas at AustinAustinTX78712USA 

出 版 物：《Acta Mechanica Sinica》 (力学学报（英文版）)

年 卷 期：2018年第34卷第6期

页      面：1167-1173页

核心收录：

学科分类：07[理学] 0701[理学-数学] 070101[理学-基础数学] 

主　　题：Bulging intervertebral disc (IVD) Elastic composite layer Asymptotic solution Finite element method 

摘      要：A bulging intervertebral disc (IVD) occurs when pressure on a spinal disc damages the once healthy disc,causing it to compress or change its normal *** medicine,most attention has been paid clinically to diagnosis of and treatment for such problems,which little effect has been made to understand such issues from a mechanics perspective,i.e.,the bulging deformation of the soft IVD induced by excessive compressive *** report herein a simple elasticity solution to understand the bulging disc *** simplicity,the soft IVD is modeled as an incompressible circular composite layer consisting of an inner nucleus and outer annulus,sandwiched between two vertebral segments which are much stiffer than the IVD and can be treated as rigid *** adopting any assumptions regarding prescribed displacements or stresses,we obtained the stress and displacement fields within the composite layer when a certain compressive stain is applied via an asymptotic *** asymptotic approach is very simple and accurate enough for prediction of the bugling profile of the *** also performed finite-element modeling (FEM) to validate our solutions;the predicted stress and displacement fields inside the composite are in good agreement with the FEM results.