Numerical model to predict the longterm mechanical stability of cementless orthopaedic implants |
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Authors: | Email author" target="_blank">M?VicecontiEmail author S?Ricci A?Pancanti A?Cappello |
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Institution: | (1) Laboratorio di Tecnologia Medica, Istituti Ortopedici Rizzoli, Bologna, Italy;(2) D.E.I.S., University of Bologna, Italy |
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Abstract: | The objective of this research was to develop a purely biomechanical model, intended to predict the long-term secondary stability
of the implant starting from the biomechanical stability immediately after the operation. A continuous rulebased adaptation
scheme was formulated as a dynamic system, and the work verified if such a model produced unique and clinically meaningful
solutions. It also investigated whether this continuous model provided results comparable with those of a simpler, discrete-states
model used in a previous study. The proposed model showed stable convergence behaviour with all investigated initial conditions,
with oscillatory behaviour limited to the first steps of the simulation. The results obtained with the wide range of initial
conditions support the hypothesis of the existence and uniqueness of the solution for all initial conditions. The differences
between the continuous model and the simpler and more efficient finite-states model were found to be extremely modest (less
than 4% over the predicted bonded area). Because of these minimal differences, the use of the much faster finite-states model
is recommended to investigate asymptotic conditions, and the continuous model described should be used to investigate the
evolution over time of the adaptive process. |
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Keywords: | Bone remodelling Interface adaptation Micromotion Cementless prostheses |
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