抄録
Currently, fracture fixation surgery using the LCP (Locking Compression Plate) is increasing. However, poor fit of plate and screw of the LCP has been reported. In other words, the problem of screw not removed has been increasing in recent years. The purpose of this study is to reproduce the situation of the poor fit of the LCP's locking system. And I aim to establish the locking system that poor fit does not occur. In this experiment, the factor with fitting failure was examined focusing on materials, tightening conditions, and the behavior of everyday life. In order to simulate the behavior of everyday life, a cyclic load was given to the fitting part. In this study, the removal torque value of the fitting portion after cyclic loading was measured. If so result in poor fit, the removal torque value is increasing. The LCP surface is anodized. Thus, using the material obtained by anodization was reproduced state of the poor fit. As a result, under all the conditions, the values of the torque loosening decreased as compared with the values of the torque tightening. Therefore, the cyclic loading simulating the behavior of everyday life, was not a factor in causing the poor fit. The same applies to the influence of anodization.
