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Title: Experimental Wear Characterization of Metal Polyethylene Hip Implant Materials using Designed and Developed Screening Devices
Researcher: Kulkarni, Anant Chandrakantrao
Guide(s): Kulkarni, D. M.
Keywords: Mechanical Engineering, Metal-Polyethylene Hip Implant Materials
University: Birla Institute of Technology and Science
Completed Date: 2015
Abstract: Prevention of premature failure of artificial hip implants has been a constant struggle for newlineorthopedic surgeons and engineers. Forty eight years ago, orthopedic community, predicted that artificial hip implant will last long for up to 30 years while enduring a highly active and athletic life. However, as on today average lifespan of hip implants is approximately 10 to 12 years, which is significantly lower than the 30 years goal set by the orthopedic community. The major newlinecause of failure of hip implant is wear. Wear mechanism at the articulating surfaces of the newlineartificial hip joint is highly complex during working conditions. With an increasing demand for prosthesis hip implantation, there is an increasing need for a more wear resistant implant design. Metal on polymer (UHMWPE) is extensively used as prosthetic pair in total hip replacement. The service life of the artificial implant is still restrained newlineby tiny Ultra-High Molecular Weight Polyethylene (UHMWPE) debris, generated by the longterm friction between the artificial femoral head and the acetabular cup. Presently, wear volume at the articulating surfaces of hip joint is measured with the help of conventional wear measuring test rigs (like pin-on-plate machines). However based upon extensive literature survey, wear newlineresults obtained from these conventional wear test rigs are not comparable with clinical (actual) wear. Therefore, there is a need to modify and customize conventional wear screening devices by incorporating motion close to in-vivo motions and serum as a lubricant having cognizant properties, protein content, viscosity as found in natural lubricant (synovial fluid) producing newlinemore accurate results on wear which will be comparable to clinical (actual) wear. newlineIn order to obtain clinical wear data an ex-vivo study is carried out on 20 explanted newlineCharnley cups of Indian patients using non-contactable white light interferometer. This retrieval study is found to be more useful to understand the wear distribution and compute wear data like linear wear
Pagination: 114p.
Appears in Departments:Mechanical Engineering

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