Anderson D R, Woo S L, Kwan M K, Gershuni D H
Division of Orthopaedics and Rehabilitation, University of California, San Diego.
J Orthop Res. 1991 Jul;9(4):550-8. doi: 10.1002/jor.1100090411.
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.
最近的研究表明，半月板在张力方面具有高度各向异性，并且其压缩蠕变行为可以用双相理论进行建模。在本研究中，采用了另一种方法，即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方向方面的各向异性和不均匀性。内侧半月板取自八匹骨骼成熟的马。从每个半月板的圆周中部，在三个圆周位置和三个轴向位置获取九个测试标本。在100 - 800Hz范围内，以100Hz的增量确定每个标本的复剪切模量大小和相角。数据是在平行和垂直于圆周方向纤维的剪切情况下收集的。发现剪切模量的大小和相角均与频率有关、具有各向异性且不均匀。剪切模量的大小随频率增加，并且在来自后上区域的标本中最大，平行于纤维进行剪切时。相角随频率略有下降，并且在前区域中部的标本中最低，垂直于纤维进行剪切时。我们的数据表明，胶原纤维在半月板纤维方向上显著增强了半月板的硬度，并且半月板的固体基质与关节软骨一样，在很大程度上表现为弹性材料。
