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Ash Harkara

Ash Harkara

VOLMO Ltd
UK

Title: Optimisation of implant position in cemented femur for lowest value of micromotion

Biography

Biography: Ash Harkara

Abstract

Total hip replacement (THR) is one of the most common and effective surgical procedures performed worldwide with the purpose of improving the quality of life of patients suffering from hip disorders. There are two major types of artificial hip replacements: cemented and uncemented. This paper presents finite element approach to measure micromotion along the stem/cement and cement/bone interface. A response surface model (RSM) was created and used to determine the best implant position for lowest value of micromotion. In this study finite element model of femur was created from 3D CT scan data using ImageSim software from VOLMO. Surface model of femur in STL format was exported into ImageSim's CAD environment where femur resection, implant positioning and alignment were done. The final assembled model of bone, cement and implant was used as the base model for creating new models. Java scripting functionality within the tool provided a robust environment for automatically rotating the implant to a new angle, exporting STL, volume meshing, applying load boundary condition and exporting volume mesh. This technique provided an efficient approach for generating new models with different implant positions in the femur bone. Around 25 models were generated in less than twelve hours. These models were then simulated in DYNAMIS solver available internally in the environment.