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The effect of physiological load configuration on interface micromotion in cementless femoral stems

Abdul Kadir, Mohammed Rafiq and Hansen, Ulrich N. (2007) The effect of physiological load configuration on interface micromotion in cementless femoral stems. Jurnal Mekanikal (23). pp. 50-61. ISSN 0127-3396

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Abstract

The most commonly reported failure modes of cementless hip stems are loosening and thigh pain; both are attributed to the relative motion at the bone-implant interface due to failure to achieve sufficient primary fixation. Accurate predictions of hip stems’ stability are therefore crucial to the pre-clinical analyses of hip arthroplasty. This study uses finite element technique to analyse the effect of muscle forces on the predicted micromotion and therefore stability of cementless femoral components. An in-house experimentally validated micromotion algorithm was used in analyses simulating two of the most common physiological activities–walking and stair-climbing. The results showed that models where muscle loads were included had ten times larger micromotion than those modelled without muscle loads. Ignoring muscle forces in any pre-clinical evaluation of femoral stems are therefore not advisable as it will overestimate the stability of the stem.

Item Type:Article
Uncontrolled Keywords:hip arthroplasty, cementless stem, finite element, muscle loadings primary stability, interface micromotion
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:8119
Deposited By: Norshiela Buyamin
Deposited On:27 Mar 2009 07:36
Last Modified:01 Jan 2014 08:30

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