THE EFFECT OF PHYSIOLOGICAL LOAD CONFIGURATION ON INTERFACE MICROMOTION IN CEMENTLESS FEMORAL STEMS
Keywords:
Hip arthroplasty, cementless stem, fi nite element, muscle loadings primary stability, interface micromotionAbstract
The most commonly reported failure modes ofcementless hip stems are loosening
and thigh pain: both are attributed to the relative motion at the bone-implant
interf ace due to fail ure to achie ve sufficient primary fixation. Accurate predictions
of hip stems ' stability are therefore crucial to tire pre-clinical analyses of hip
arthroplasty. This study uses fin ite element technique to analyse the effect of
muscle fo rces a ll the predicted micromotion and therefore stability of cementless
f emoral components. An in-house experimentally validated micromotion algorithm
was used in analyses simulating hl'O of the most common physiological activitieswalking
and stair-climbing. The results showed that models where mus cle loads
were included had ten times larger micromotion than those model/ed without
muscle loads. Ignoring muscle forces in any pre-clinical evaluation offe moral
stems are theref ore not advisable as it will overestimate the stability of the stem.
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