Anisotropic viscoelastic shear properties of bovine meniscus.
Anisotropic viscoelastic shear properties of bovine meniscus.
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DOI：
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发表时间：
1994-09
影响因子：
4.2
通讯作者：
W. Zhu;Chern Ky;V. Mow
中科院分区：
文献类型：
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作者：
W. Zhu;Chern Ky;V. Mow
本研究的目的是确定牛半月板的粘弹性剪切特性，并检查这些变化与组织的结构组织。圆盘状半月板试样经受：(1)生理频率范围内的振荡剪切变形（1-100拉德/秒），以及(2)无限小应变范围内的剪切变形（0.005-0.05拉德）。通过实验确定了动剪切模量和瞬态剪应力松弛函数。动态剪切模量在3个压应变水平（7%、10%、13%）下测量。通过测试轴向、径向和周向取向的试样来检查剪切性能的方向变化。实验表明，半月板组织在剪切中表现出固有的粘弹性行为，这取决于频率、剪切应变和压缩应变。剪切各向异性是明显的，并依赖于压缩。在低压缩应变（10%）下，周向和轴向试样之间无统计学差异。这些结果表明，半月板的各向异性剪切特性与半月板内胶原纤维的取向有关。
The objectives of this study were to determine the viscoelastic shear properties of bovine menisci and to examine those variations with respect to the structural organization of the tissue. Disc shaped meniscal specimens were subjected to: (1) oscillatory shear deformation over a physiological range of frequencies (1-100 rads per second), and (2) shear deformation in the range of infinitesimal strains (0.005-0.05 rad). The dynamic shear modulus and the transient shear stress relaxation function were determined from the experiments. The dynamic shear modulus was measured at 3 levels of compressive strain (7%, 10%, 13%). Directional variations in shear properties were examined by testing axially, radially, and circumferentially oriented specimens. The experiment showed that meniscal tissue exhibits intrinsic viscoelastic behavior in shear that depends on frequency, shear strain, and compressive strain. Shear anisotropy is evident and is dependent upon compression. At low compressive strains ( 10%), no statistically significant difference was found between the circumferentially and axially oriented specimens. These results suggest that the anisotropic shear properties of the meniscus are related to the collagen fiber orientation within the meniscus.