张应力对兔骺软骨作用的生物力学研究

张应力牵拉骺软骨促使肢体延长是近年来广为关注的方法。本文采用２０只新西兰幼兔新鲜离体股骨，在ＩＮＳＴＲＯＮ试验机上作兔骺软骨不同张应力下塑性变形，断裂和应力松驰性质研究，结果发现离体兔股骨随牵张力的增大或间隙时间的增加塑性变形亦增大，应力随时间的增加而近似呈对数曲线下降。

BIOMECHANICAL STUDY ON THE TENSION-STRESS EFFE-CT UPON THE EPIPHYSEAL CARTILAGE

Limb lengthening by applying the tension-stress stimulated epiphyseal cartilage as a method ofclinical application has been gained popularity recently. Isolated fresh femur bones from 20immature New Zealand white. rabbits were tested under INSTRON machine to investigate theplastic elongation, breaking force and stress relaxation of the biomechanics properties of theepiphyseal cartilage. The result showed that the mean plastic elongation of isolated femur was greatin connection with the tension force increased or persistence time prolonged. The tension relaxationwas decreased in logarithmic curve by time prolonged. Our findings suggest that the low tensilestress had stimulating effects on the epiphyseal cartilage increased in length and no influenced theultimate strength of bone. The Persistence time which tension force performed prolonged, the effectof limb lengthening could be enhanced. It is suitable for the tension force level which higher thanthe original force against stress relaxation. The purpose of this study was to provide theoreticalbasis for clinic bone lengthening.