摘要
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为松弛性质研究，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。表明以较小的张应力能实现肢体增长而不影响其强度。延长维持张应力的时间可以增大肢体的生长量。为避免应力松弛在不造成骨折的情况下，以高出原张应力作为初始张力较适宜。以期为临床骨延长术提供理论依据。
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.
出处
《医用生物力学》
EI
CAS
CSCD
1999年第3期180-184,共5页
Journal of Medical Biomechanics
关键词
张应力
骺软膏
塑性变形
应力松驰
tensile stress, epiphysial cartilage, plastic elongation, stress relaxation
