髋关节置换前后股骨上应力的变化

为研究全髋关节置换前后股骨上应力水平及分布规律的变化，用电阻应变实验比较置换前后股骨上应力的改变；并且建立一种合理的、具有预见性的有限元模型。研究结果表明：全髋关节置换后，股骨上应力水平明显下降；并与关节假体颈长颈干角有一定关系。尤其指出，髋关节置换导致股骨弹性模量下降；从而给出关节置换后骨重建的循环模式。

STRESS DIFFERENCE ON FEMUR AFTER TOTAL HIP REPLACEMENGT

In order to study difference of stress levels and stress distribution on femur after total hip replacement,the data of experiments and finite element analyses were recorded.After good agreement was obtained between surface strains from experiments and the finite element analyses,the finite element model was construeted,which provided the capability to determine the stresses on femur.The analysis results showed that total hip replacement reduced evidently the femoral stress levels,changed the stress distribution on femur,and resulted in reduction of femoral elastic modulus.The stresses of femur had relation to cervical length and cervicodiaphyseal angle of femoral implant.It was pointed out particuarly that there was the cycle mode of bone reconstructin in designing femoral implant.