The Effects of Interfacial Conditions and Stem Length on Potential Failure Mechanisms in the Uncemented Resurfaced Femur |
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Authors: | Sanjay Gupta Bidyut Pal Andrew M R New |
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Institution: | (1) Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, Kharagpur, 721 302, West Bengal, India;(2) Bioengineering Science Research Group, School of Engineering Sciences, University of Southampton, Southampton, SO17 1BJ, United Kingdom |
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Abstract: | It is hypothesized that changes in stem length and implant–bone interfacial conditions would affect the mechanical environment
within the uncemented resurfaced femur, thereby influencing potential short- and long-term failure mechanisms. This study
is aimed at investigating the influence of changes in implant–bone interfacial conditions and stem length on eventual failure,
using 3D FE models integrated with bone remodeling simulations. Musculoskeletal forces corresponding to normal walking and
stair climbing were used as applied loading conditions. Sliding micromotions of 26–72 μm at the implant–bone interfaces for
both the stem designs suggest bone ingrowth on the coated surface of the implant was likely. The initial risk of femoral neck
fracture was less for the uncemented designs as compared to the cemented designs, irrespective of interfacial conditions and
variation in stem length. For the uncemented variety, shortening the stem length provided only slight advantages (5%) with
regard to strain shielding and bone remodeling. However, bone resorption was considerably higher when fully bonded interfaces
were simulated. It may, therefore, be concluded that cementless fixation seems to be a viable alternative to cemented fixation,
provided sufficient initial fixation and secondary stability through bone ingrowth into the coated surface of the implant
can be achieved. |
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Keywords: | |
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