中文摘要：

目的关节软骨是覆盖在关节骨表面的一层承重生物组织，软骨组织成分的微小变化都会导致软骨的退化，所以研究软骨的材料属性具有重要意义。方法本文在3参数三相模型的基础上，提出了非匀质4参数三相模型，用来估计软骨的轴向模量舶，并预测了关节软骨的膨胀模式。结果运用非匀质4参数三相模型可以提取更精确的软骨轴向模量，与其它模型相比，该模型对软骨膨胀的预测结果更接近实验结果。结论该模型可以更准确地描述软骨组织随深度变化的材料属性。

英文摘要：

Objective To study the material attribute of articular cartilage. Methods An improved 4 parameters inhomogeneous triphasic model based on 3 parameters model was developed to estimate the uniaxial modulus Ha of cartilage and to predict the swelling pattern of cartilage. Results The results showed that more accurate uniaxial modulus can be extracted using 4 parameters inhomogeneous triphasic model, and the predicted results appeared to match the experimental strain data better than other models. Conclusion Inhomogeneous 4 parameters triphasic model can describe the depth-dependent material attribute of articular cartilage more exactly.