髌骨软骨粘弹特性的实验研究

目的通过对髌骨软骨生物力学特性的研究,探讨髌骨软化症的病因。方法测定８例新鲜髌骨软骨标本的粘弹特性,观察载荷（５００Ｐａ）对离体髌骨软骨的松弛和蠕变效应。结果得到了生理状态定载荷条件下的位移—时间曲线和定变形条件下的载荷—时间曲线及其相关数据。结论不适当的载荷可破坏髌骨软骨的粘弹性和软骨的负反馈调节机制,导致软骨退变。

An experimental study of viscoelastic properties of articular-cartilage of patella

OBJECTIVE: To study the viscoelastic properties of human articular cartilages of patella in 8 cadavers, which were obtained from patients ranged in age from nineteen to fifty-one years old and died of acute head injury. METHODS: The creep and stress relaxation of articular cartilage of patella were abserved in the condition of articular cartilage loaded of 500 Pa, just as the physiological load of articular cartilage of patella in keeping human body standing position with the knee joint flexed 30 degrees, during the experiment. The deformation-time curve under certain load, the load-time curve under certain deformity and related data were obtained. RESULTS: Creep and stress relaxation showed that obvious changes occured in the first 10-15 minutes during the whole process. CONCLUSIONS: The data and curve will not only be helpful to understand the pathogenesis of chondromalacia, but also propose a feasible method to study it from biomechanical view, meanwhile provide reference data for designing the prosthesis of patella and material choosing.