摘要
目的探讨兔正常和挛缩膝关节髌韧带的轴向应力－应变关系。方法将兔膝关节伸直位制动６周，复制伸直型挛缩膝关节动物模型，分别在３７℃、４２℃的条件下，对正常和挛缩膝关节的髌骨－髌韧带－胫骨组合体行拉伸试验，根据实验数据类型导出髌韧带的本构方程，并作出其应力－应变关系理论曲线。结果正常和挛缩膝关节髌韧带的应力－应变关系可用指数函数来描述，同一温度下，二组之间髌韧带的应力－应变关系理论曲线明显不同，其材料常数（Ｘ１、Ｘ２）亦有显著性差异（Ｐ＜０．０１）。结论①膝关节制动６周后，其髌韧带将进行功能重建，导致其轴向应力－应变关系的改变；②３７℃和４２℃的温差对髌韧带的轴向应力－应变关系无显著性影响。
Objective To discover the axial stress- strain relationship of patellar tendon (PT) of normal and contracture knee in rabbit. Methods The rabbit knee was immobilized in extension for 6 weeks,then the mechanical properties of PT and the effect of temperature on it were investigated at 37℃ and 42 ℃. Results The stress -strain relationship of PT could be expressed with exponental functions. At the same temperature, the theoretical curves of stressstrain and two material constants of PT were significantly different between normal and contracture knee,but there were no significant differences between 37℃ and 42℃ in either normal or contracture knee.Conclusion ①PT would remodel and its material constants would change when knee is immobilized for 6 weeks; ②The effects of 5℃ differential temperature on stressstrain relationship of PT were not significant.
出处
《中华物理医学杂志》
CAS
CSCD
1998年第1期19-22,共4页
Chinese Journal of Physical Medicine and Rehabilitation
关键词
膝关节
应力
关节挛缩
髌韧带
knee joint/phsiol
tendons,paraarticular/phsiol
stress,mechanical
