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Nonhomogeneous permeability of canine anulus fibrosus.

机译：犬环纤维的通透性不均匀。

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STUDY DESIGN: This report examines the permeability coefficient and aggregate modulus of slices of anulus cut from canine lumbar intervertebral discs. OBJECTIVES: To examine the influence of radial position on the properties of these materials, including outer samples with intact anulus edge. SUMMARY OF BACKGROUND DATA: The outer edge of anulus fibrosus shows radial bulge during axial compression of motion segments. The radial bulge increases monotonically when the axial compression is sustained for several hours, until a plateau is reached. Triphasic modeling of axial compression shows that this time course of radial bulge can not be obtained using a uniform permeability coefficient according to values in the literature. METHODS: Confined consolidation experiments (controlled load) were designed to measure the time course of uniaxial deformation of samples of anulus that were 4 mm in diameter and 1 mm tall. The rotation symmetry axis of the samples was defined in the radial direction of the disc. The radial permeability coefficient and the aggregate modulus were determined using the consolidation data and the linear biphasic theory. RESULTS: The permeability coefficient was lower at the periphery than in deeper layers of the anulus. Outer samples with outer surfaces that were 0.0-0.5 mm from the anulus edge had an average permeability coefficient of (1.02 +/- 0.57) x 10(-16) m4/Ns (n = 24). Inner samples that were 2.0-2.5 mm from the anulus edge had an average permeability coefficient of (2.81 +/- 0.98) x 10(-16) m4/Ns (n = 13). The aggregate modulus HA of outer samples was significantly higher (HA = 1.56 +/- 0.34 MPa) than that of inner samples (HA = 1.31 +/- 0.47 MPa). CONCLUSIONS: The fact that the outer anulus is less permeable than the inner anulus may explain why radial bulge of anulus fibrosus increases monotonically in time to an equilibrium value during sustained axial compression of a motion segment.
机译：研究设计：本报告检查了犬腰椎间盘切开的环的切片的渗透系数和总模量。目的：研究径向位置对这些材料的性能的影响，包括具有完整环面边缘的外部样品。背景数据摘要：纤维环的外边缘在运动节段的轴向压缩过程中显示径向隆起。当轴向压缩持续几个小时直到达到平稳状态时，径向凸起会单调增加。轴向压缩的三阶段建模表明，根据文献中的值，使用均匀的渗透系数无法获得此径向凸起的时间过程。方法：设计密闭固结实验（控制载荷），以测量直径为4毫米，高度为1毫米的环礁样品单轴变形的时间过程。样品的旋转对称轴在圆盘的径向上定义。使用固结数据和线性双相理论确定径向渗透系数和聚集模量。结果：环的渗透系数比环的深层低。外表面距圆环边缘0.0-0.5 mm的外部样品的平均渗透系数为（1.02 +/- 0.57）x 10（-16）m4 / Ns（n = 24）。距圆环边缘2.0-2.5毫米的内部样品的平均渗透系数为（2.81 +/- 0.98）x 10（-16）m4 / Ns（n = 13）。外部样品的总模量HA（HA = 1.56 +/- 0.34 MPa）明显高于内部样品的总模量HA（HA = 1.31 +/- 0.47 MPa）。结论：外环比内环的渗透性低这一事实可以解释为什么在运动段的持续轴向压缩过程中，纤维环的径向凸起在时间上单调增加到一个平衡值。

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