VISCOELASTIC SHEAR PROPERTIES OF THE EQUINE MEDIAL MENISCUS
VISCOELASTIC SHEAR PROPERTIES OF THE EQUINE MEDIAL MENISCUS
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DOI：
10.1002/jor.1100090411
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发表时间：
1991-07-01
影响因子：
2.8
通讯作者：
GERSHUNI, DH
中科院分区：
文献类型：
--
作者：
ANDERSON, DR;WOO, SLY;GERSHUNI, DH
最近的研究表明，半月板具有高度的各向异性，其压缩蠕变行为可以用双相理论来模拟。在本研究中，采用了另一种方法，测量半月板纤维软骨的粘弹性剪切特性，以确定该组织在标本位置和纤维取向方面的各向异性和不均匀性。从8匹骨骼成熟的马身上获得内侧半月板。在每个半月板的三个周向和三个轴向位置取9个试样。在100-800 Hz范围内，以100 Hz的增量确定了每个试件的复合剪切模量和相位角的大小。数据收集平行和垂直剪切的圆周取向的纤维。剪切模量和相位角的大小都是频率相关的、各向异性的和不均匀的。剪切模量的大小随频率增加而增加，并且在与纤维平行剪切的后上区域的标本中最大。相位角随频率的增加而减小，在垂直于纤维方向剪切的前区中间部位的相位角最小。我们的数据表明，胶原纤维在纤维的方向上使半月板大大硬化，半月板的固体基质，如关节软骨，在很大程度上表现为弹性材料。
Recent studies have shown that the meniscus is highly anisotropic in tension and that its compressive creep behavior can be modeled using biphasic theory. In this study, an alternative approach is used, where viscoelastic shear properties of the meniscal fibrocartilage are measured to determine the anisotropy and inhomogeneity of this tissue with respect to specimen location and fiber orientation. Medial menisci were obtained from eight skeletally-mature horses. Nine test specimens were taken from the circumferential midsubstance of each meniscus, at three circumferential and three axial positions. The magnitude of the complex shear modulus and the phase angle were determined for each specimen from 100-800 Hz, in 100 Hz increments. Data were gathered shearing parallel and perpendicular to the circumferentially-oriented fibers. The magnitude of the shear modulus and the phase angle were both found to be frequency dependent, anisotropic, and inhomogeneous. The magnitude of the shear modulus increased with frequency, and was greatest in specimens from the posterior superior region, shearing parallel to the fibers. The phase angle decreased slightly with frequency and was lowest in specimens from the midsubstance of the anterior region, shearing perpendicular to the fibers. Our data demonstrated that collagen fibers substantially stiffen the meniscus in the direction of its fibers and that the solid matrix of the meniscus, like articular cartilage, behaves largely as an elastic material.