By the biodegradability which is one of the characteristics of poly lactic acid, poly lactic acid is expected as a bone screw and a plate for bone fixation. But There are problems such as strength or lack of ductility in mechanical property. In this study, Improvement of strength in poly lactic acid by giving extension processing was planned. There for pulling strength and Bending strength of poly lactic acid in the case of two, three and four times extension rate was examined.
