Mechanical Evaluation of Dynamic Hip Screw (DHS) for Trochanteric Fracture

Ong, Shu Sian (2018) Mechanical Evaluation of Dynamic Hip Screw (DHS) for Trochanteric Fracture. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

This project studies aimed to present the mechanical performance and implement the design of side plate of DHS in order to eliminate the compression screw which is part of DHS where attached between lag screw and side plate. The simulation has been carried out by using software of Solidworks with the method of finite element analysis. For the design of dynamic hip screw, is to research all the relevant papers for redesign, reducing the material as well as reduce the stress occurred at the side plate. The background of the trochanteric fracture has been included to understand how the fractures happened and place in which in the upper part of femur bone. The each part of dynamic hip screw is briefed about the characteristic and roles towards the femur. Through the methodology, the designs has been determined and also the material properties as well with the with and without compression screws of dynamic hip screw. The data recorded have to be lower than the yield strength of material dynamic hip screw, stainless steel 172.4MPa. Hence, the von Mises stress that have recorded has been partially accepted as the standard design has been exceed in the boundary condition where the forces applied on the knee joint and fix on femoral head. From result, there are three boundary conditions that have generated in order to get the different values among the three designs. In the first condition where different forces applied on the femoral head and fixed on the knee joint, the data has been determined, which the stress are around 23.2 to 42.7 with the increment of 100N of forces respectively. While for the second boundary condition for stresses have been generated among the three designs are 161.8 MPa , 45.21 MPa and 43.08 MPa respectively. The von Mises stress in the third boundary condition has been recorded as 178.2 MPa, 41.66 MPa, and 24.56 MPa respectively. Modified design 2 has the best choices among the three designs as the stresses are within the range of the yield strength and also the least stresses developed.