The Modeling Study of Stress on Femur and DCP with Valgus and Varus Knee

Abstract

Human femur broken is one of the most frequent type of bone fractures. Basically, the widely used techniques in an internal repair is using the Dynamic Compression Plate (DCP). In addition to the configuration of the screw position plays a major role of the DCP stress, the varus and valgus knee is a factor as well. This research is proposed to investigate the stress distribution go around on the DCP by vary angle of a femur represent to valgus knee using Finite Element Analysis (FEA). To find out the stress, the body weight assumed to be constant at 70 kg. The DCP with the screws were fixed on femur for 12 units. The results from finite element analysis were compared with other authors for the normal conditions, the results moved on the same way. The results were found that the maximum Von Mises stress on the DCP was occurred on the unused hole. Both valgus and varus knee the maximum reaction forces is at lateral condyle than medial condyle and the delta of reaction forces go around 310 N plus. Both valgus and varus knee can be fixed by using DCP if the femur take angle with vertical line not reach 20 degrees. From the results also reveals that osteoarthritis from valgus knee more severe than varus knee, female have a chance to face osteoarthritis more than male due to femur angle of female larger than male.