Validation of FE micromotions and strains around a press-fit cup: introducing a new micromotion measuring technique.

Annals of Biomedical Engineering
S G ClarkeA M J Bull

Abstract

Finite element (FE) analysis provides an useful tool with which to analyze the potential performance of implantations in a variety of surgical, patient and design scenarios. To enable the use of FE analysis in the investigation of such implants, models must be experimentally validated. Validation of a pelvic model with an implanted press-fit cup in terms of micromotion and strain is presented here. A new method of micromotion has been introduced to better describe the overall movement of the cup within the pelvis. The method uses a digitizing arm to monitor the relative movement between markers on the cup and the surrounding acetabulum. FE analysis was used to replicate an experimental set up using a synthetic hemi-pelvis with a press-fitted all-metal cup, subject to the maximum loading observed during normal walking. The work presented here has confirmed the ability of FE models to accurately describe the mechanical performance of the press-fitted acetabulum and surrounding bone under typical loading conditions in terms of micromotion and strain distribution, but has demonstrated limitations in its ability to predict numerical micromotion values. A promising digitizing technique for measuring acetabular micromotions has also b...Continue Reading

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Citations

Jan 3, 2013·International Journal for Numerical Methods in Biomedical Engineering·Pankaj Pankaj
Aug 25, 2015·Orthopaedics & Traumatology, Surgery & Research : OTSR·F AmiroucheR Barmada
Aug 27, 2013·Journal of Biomechanics·Jacob T MunroVickie B Shim
Jul 15, 2017·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Noel ConliskPankaj Pankaj
Sep 10, 2014·Journal of Biomechanical Engineering·Jacob T MunroVickie B Shim
Jun 6, 2019·JBJS Reviews·Daniel H WizniaWilliam J Long

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