BIPHASIC INDENTATION OF ARTICULAR-CARTILAGE .2. A NUMERICAL ALGORITHM AND AN EXPERIMENTAL-STUDY
BIPHASIC INDENTATION OF ARTICULAR-CARTILAGE .2. A NUMERICAL ALGORITHM AND AN EXPERIMENTAL-STUDY
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DOI：
10.1016/0021-9290(89)90069-9
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发表时间：
1989-01-01
影响因子：
2.4
通讯作者：
ATHANASIOU, KA
中科院分区：
文献类型：
--
作者：
MOW, VC;GIBBS, MC;ATHANASIOU, KA
第一部分（Mark et al., 1987， J. Biomechanics 20,703 -714）提出了蠕变和应力松弛条件下关节软骨双相压痕的理论解决方案。在本研究中，我们利用蠕变解，开发了一种有效的数值算法来计算压痕蠕变实验中关节表面软骨原位的所有三个材料系数。用这种方法确定了骨料模量的平均值。年轻牛股骨髁软骨原位泊松比和渗透性HA = 0.90 MPa, .nu。S = 0.39, k = 0.44。10 ~ 15 m4/N s，髌骨沟软骨HA = 0.47 MPa, .nu。S = 0.24, k = 1.42。10 - 15 m4 / Ns。本研究的一个令人惊讶的发现是，原位软骨泊松比（0.13-0.45）可能比文献中报道的切除骨软骨塞测量结果（0.40-0.49）要小得多。我们还发现髌骨沟软骨的通透性比股骨髁软骨高几倍。这些发现可能对理解原位软骨的功能行为和使用压痕实验确定软骨弹性模量的方法具有重要意义。
Part I (Mark et al., 1987, J. Biomechanics 20, 703-714) presented the theoretical solutions for the biphasic indentation of articular cartilage under creep and stress-relaxation conditions. In this study, using the creep solution, we developed an efficient numerical alogorithm to compute all three material coefficients of cartilage in situ on the joint surface from the indentation creep experiment. With this method we determined the average value of the aggregate modulus. Poisson''s ratio and permeability for young bovine femoral condylar cartilage in situ to be HA = 0.90 MPa, .nu.s = 0.39 and k = 0.44 .times. 10-15 m4/N s respectively, and those for patellar groove cartilage to be HA = 0.47 MPa, .nu.s = 0.24, k = 1.42 .times. 10-15 m4/Ns. One surprising finding from this study is that the in situ Poisson''s ratio of cartilage (0.13-0.45) may be much less than those determined from measurements performed on excised osteochondral plugs (0.40-0.49) reported in the literature. We also found the permeability of patellar groove cartilage to be several times higher than femoral condyle cartilage. These findings may have important implications on understanding the functional behavior of cartilage in situ and on methods used to determine the elastic moduli of cartilage using the indentation experiments.