摘要
目的 探讨正常关节软骨的压缩特性。方法 将人的股骨头软骨制成圆柱形标本,分A、B、C、D四组。应用两种不同力学实验装置分别对A、B组标本加载,测定标本在受压后1秒末的应力和应变值,作出应力-应变曲线图。C组标本在恒定压力下受载,测量标本在受压后不同时间应变值的变化。D组标本受压后并保持一定的应变值,观察关节软骨受压后不同时间压力的变化。结果(1)正常关节软骨的瞬时应力-应变曲线呈非线性关系,应力越大,弹性模量值越高;两种装置的实验结果具有明显差异性。(2)关节软骨在恒定应力作用下,应变随时间的延长而增大,最终达到一恒定值。(3)关节软骨在保持一定应变所需要的应力,将随着时间的延长而不断减小,最终达到一恒定值。结论 关节软骨是一种很好的粘弹性材料,具有良好的弹性和瞬时抗压特性。对软骨采用不同方式加压,所测定的瞬时弹性模量值具有显著差异。
Objective To study the compression properties of normal articular cartilage. Methods 40 cylinder specimens were divided into A B C D groups randomly. Group A and B were used to measure stresses and strains of articular cartilage after one - minute compression by using two different micro - mechanical setups. Group C was used to measure changes of strains with time under static loading. Group D was used to measure changes of stresses with time under static strain compression. Results CD The instantaneous stress - strain curves were nonlinear and the difference between the elastic moduli of the two setups was statistically significant. (2) When articular cartilage compressed under static loading, strain increased with time and attained its maximum eventually. ￤hen articular cartilage compressed under static strain, stress decreased with time and attained equilibrium eventually. Conclusion Articular cartilage is a good viscoelastic material and has great elasticity and instantaneous anti - compression property. The instantaneous moduli measured with the above two setups are different.
出处
《医用生物力学》
EI
CAS
CSCD
2003年第1期28-33,共6页
Journal of Medical Biomechanics
关键词
关节软骨
生物力学
粘弹性
Articular cartilage
Biomechanics
Viscoelasticity
