基于六轴空间支架的胫骨骨折端力学环境测量方法研究

Research on measurement method of mechanical environment of tibial fracture end with six-axis special frame

骨折端力学环境监测对判断骨折愈合情况、指导康复训练有重要意义。设计了一种基于六轴空间支架的胫骨骨折端力学环境测量方法。在支架连杆上安装了拉压传感器,结合并联Stewart机构的空间运动学,推导了骨折端力学环境的测量方法。并通过软件仿真和实验,验证了该方法的准确性。研究结果表明,该方法的误差率在可接受范围内,且随着轴向压力和愈伤组织替代物弹性模量的增加,误差率整体呈下降趋势。该测量方法可以为医生对骨折恢复情况的判断提供理论依据。

The mechanical environment monitoring of tibial fracture end is of great significance for judging fracture healing and guiding rehabilitation training.A measure method of the mechanical environment of the tibial fracture end based on six-axis special frame is proposed.Tension/compression force sensors are installed at the linkages.Force calculate method is deduced at tibial fracture end by using the spatial kinematics method of parallel Stewart mechanism.The accuracy of the method is verified by software simulation and experiment.Experimental results show the error rate of the method is in the acceptable range.The error rate is decreasing with the increase of axial pressure and elastic modulus of callus substitute.The measurement method can provide a theoretical foundation for doctors to judge the fracture recovery.