Poroelastic creep response analysis of a lumbar motion segment in compression
Poroelastic creep response analysis of a lumbar motion segment in compression
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DOI：
10.1016/0021-9290(96)00035-8
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发表时间：
1996-10-01
影响因子：
2.4
通讯作者：
ShiraziAdl, A
中科院分区：
文献类型：
--
作者：
Argoubi, M;ShiraziAdl, A
研究了恒定轴压（400,1200或2000 N）下腰椎运动节段的非线性三维孔弹性蠕变响应2小时。研究了小关节、应变相关变量渗透率、边界孔隙压力和耦合矢状面旋转对响应的作用。生物力学的环切除，核切开术，和面切除也进行了研究。同时考虑了材料非线性和几何非线性。环体被模拟为胶原纤维和环体的非均匀复合材料。随着时间的推移，轴向位移增大，孔隙压力减小，环空体承受更大的压应力，纤维层变得松弛，切面承受更大的载荷。手术改变明显软化颞部反应并增加关节突受力。相反，应变相关的可变渗透率和边界孔隙压力使响应变硬，并降低了作用在切面上的力。核液含量、关节突、边界孔隙压力和椎间盘通透性的变化显著影响腰椎生物力学。版权所有爱思唯尔科学有限公司
The nonlinear three-dimensional poroelastic creep response of a lumbar motion segment under a constant axial compression (400, 1200, or 2000 N) is investigated for a period of 2 h. The role of facet joints, strain-dependent variable permeability, boundary pore pressure, and coupled sagittal rotation on response is studied. Biomechanics of annulus excision, nucleotomy, and facetectomy are also investigated. Both material and geometric nonlinearities are considered. The annulus bulk is modelled as a nonhomogeneous composite of collagenous fibers and annulus bulk. As time progresses, axial displacement increases, pore pressure decreases, annulus bulk undergoes larger compressive stresses, fiber layers become slack, and facets carry larger loads. Surgical alterations markedly soften the temporal response and increase facet forces. In contrast, the strain-dependent variable permeability and boundary pore pressure stiffen the response and decrease forces on the facets. Changes in the nucleus fluid content, facet joints, boundary pore pressure, and disc permeability markedly influence the lumbar biomechanics. Copyright (C) 1996 Elsevier Science Ltd.