Publication: Finite element analysis on hip implant
Loading...
Date
2008-04-01
Authors
Kwan, Shiau Yoke
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
At present, total hip replacement has become a very common operation with over 300000 procedures carried out world-wide every year. Hip replacement is a medical procedure to replace damage hip joint by a synthetic implant. The purpose of the surgery is to restore patient's ability to carry on daily activities. However, the failure of the hip implant to function properly is an event that has been repeatedly reported in the literature. This research is attempted to generate a validated finite element (FE) model of current hip implant design which is capable of predicting the mechanical failure of different implant cup alignment. different implant materials as well as the corresponding stress distribution in the implant. The study involves static and dynamic analysis, which represent patient's standing and walking loading conditions. SolidWorks was utilized to model the hip implant and Ansys 9.0 was selected as the FEA analysis tools. From analysis results, hip implant with 45° cup inclination angle with Ti-6Al-4V. material appears to be the best selection for hip implant. Modification of current design was done based on static and dynamic simulation of current design. Three modifications had been made in the new design implant and simulations process was repeated for new design. The results from this simulation were compared with the current implant design's simulation result and this showed that the stresses and the displacement value in design are much less then the current design. Tho maximum von mises stress under static loading condition for new implant design is 16SAPa while for the current implant in market is. 787MPs. This means that, there are improvements in the designed hip implant and this design cun be accepted.