Viscoelastic Analysis on Human Femoral Head Cartilage and Meniscus

In order to study the differences in mechemics between normal and abnormal cartilage of human articulation， the authors do the viscoelastic analysis experiment. The stress relaxation and creep test were performed. For normal and abnormal meniscus, the slope of relaxation curve G(t) with lnt K_r is -0.1179 and -0.0856, G_e (the value of G(t) at the end) is 0.5250 and 0.571 0 respectively. For normal and abnomal cartilage of femoral head, the K_r is -0.101 4 and -0.063 3, G_e is 0.591 5 and 0.663 2 respectively. For normal and abnommal meniscus， the K_c (the slope of creep curve J( t ) and 0.663 2 respectively. For normal and abnormal meniscus， the K_c (the slope of creep curve J( t ) with Int) is 0.208 0 and 0.1095，J_e(the value of J(t) at the end) is 1.953 8 and 1.493 1 respectively. For normal and abnormal cartilage of femoral head, the K_c is 0.167 3 and 0.120 7, J_e is 1.854 9 and 1.599 8 respectively. The stress relaxation and creep quantity of abnormal specimens evidently move less than that of nomal group. The main reason is collagen degeneration and decrease in proteoglycan.