股骨—人工假体之间的界面生物力学分析

目的 对股骨-人工假体之间的界面生物力学进行分析。方法 应用非均质层状材料弯曲和扭转理论计算模型，定量分析了单足站立相及坐位起立时股骨干在不同假体植入前、后的应力分布情况。结果 由于股骨-假体界面两边材料性能不同，产生的较大应力差异是引起界面松动、剥离和损坏的生物力学原因。不同假体的弹性模量不同，产生应力遮挡的程度不同。结论 复合材料假体植入后应力遮挡率最低。羟磷灰石表面涂层假体能缓和界面层的应力差异。

A Study of Interface Biomechanical Properties Between Femora and Prosthesis

Objective: To analyze the interface biomechanical properties between femora and prosthesis. Methods Theory models of bending and torsion for non-homogeneous layer-like materials were used to quantify the stress distribution when the femora were loaded in single foot stance and stance from seating, both before and after the replacement of different prosthesis. Results As the material properties of interface were different between bone and prosthesis, the bigger the difference, the greater the stress was in the result in the interface of losing, stripping and damage. Difference in young's modulus of the different prosthesis resulted in different levels of stress shielding. Conclusion The prosthesis with composite materials significantly reduced stress shielding. The hydroxyapatite-coated prosthesis helped to reduce stress difference at bone and prosthesis interface.