Inter-subject variability effects on the primary stability of a short cementless femoral stem

Journal of Biomechanics
Mamadou T BahMartin Browne

Abstract

This paper is concerned with the primary stability of the Furlong Evolution(®) cementless short stem across a spectrum of patient morphology. A computational tool is developed that automatically selects and positions the most suitable stem from an implant system made of a total of 48 collarless stems to best match a 3D model based on a library of CT femur scans (75 males and 34 females). Finite Element contact models of reconstructed hips, subjected to physiologically-based boundary constraints and peak loads of walking mode, were simulated using a coefficient of friction of 0.4 and an interference-fit of 50 μm. Maximum and average implant micromotions across the subpopulation were predicted to be 100±7 μm and 7±5 μm with ranges [15 μm, 350 μm] and [1 μm, 25 μm], respectively. The computed percentage of implant area with micromotions greater than reported critical values of 50 μm, 100 μm and 150 μm never exceeded 14%, 8% and 7%, respectively. To explore the possible correlations between anatomy and implant performance, response surface models for micromotion metrics were constructed. Detailed morphological analyses were conducted and a clear nonlinear decreasing trend was observed between implant average micromotion and both th...Continue Reading

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Citations

Sep 25, 2017·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Rami M A Al-DiriniMark Taylor
Nov 6, 2018·International Journal for Numerical Methods in Biomedical Engineering·Dermot O'RourkeMark Taylor
Feb 6, 2019·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Amelie SasG Harry van Lenthe
Aug 25, 2016·Annals of Biomedical Engineering·Hwabok WeeGregory S Lewis
Feb 6, 2020·Biomechanics and Modeling in Mechanobiology·Azhar A AliPeter J Laz
Aug 24, 2017·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Dermot O'RourkeMark Taylor
Apr 9, 2020·Orthopaedics & Traumatology, Surgery & Research : OTSR·Ibraheim El-DalyElhadi Sariali

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