PMID: 16532611Mar 15, 2006Paper

Cortical bone viscoelasticity and fixation strength of press-fit femoral stems: finite element model

Journal of Biomechanical Engineering
T R ShultzTimothy L Norman

Abstract

Many cementless implant designs rely upon a diaphyseal press-fit in conjunction with a porous coated implant surface to achieve primary or short term fixation, thereby constraining interface micromotion to such a level that bone ingrowth and consequent secondary or long-term fixation, i.e., osseointegration, can occur. Bone viscoelasticity, however, has been found to affect stem primary stability by reducing push-out load. In this investigation, an axisymmetric finite element model of a cylindrical stem and diaphyseal cortical bone section was created in order to parametrically evaluate the effect of bone viscoelasticity on stem push-out while controlling coefficient of friction (mu = 0.15, 0.40, and 1.00) and stem-bone diametral interference (delta = 0.01, 0.05, 0.10, and 0.50 mm). Based on results from a previous study, it was hypothesized that stem-bone interference (i.e., press-fit) would elicit a bone viscoelastic response which would reduce the initial fixation of the stem as measured by push-out load. Results indicate that for all examined combinations of mu and delta, bone viscoelastic behavior reduced the push-out load by a range of 2.6-82.6% due to stress relaxation of the bone. It was found that the push-out load inc...Continue Reading

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Citations

Mar 14, 2016·Orthopaedics & Traumatology, Surgery & Research : OTSR·F AmiroucheA Walia
Jan 3, 2013·International Journal for Numerical Methods in Biomedical Engineering·Pankaj Pankaj
Nov 27, 2007·Journal of Biomechanics·Mohammed Rafiq Abdul-KadirAndrew Amis
Aug 3, 2010·Medical Engineering & Physics·Travis BurgersHeidi-Lynn Ploeg
Sep 7, 2014·International Orthopaedics·Boris StenoLibor Necas
Apr 5, 2017·Current Opinion in Rheumatology·Graeme Michael Campbell, Claus-C Glüer
Jan 22, 2008·Journal of Biomechanics·Travis A BurgersHeidi L Ploeg
Nov 29, 2012·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Ling WangZhongmin Jin
Nov 16, 2013·Journal of Biomechanical Engineering·Leila MalekmotieiAref Samadi-Dooki
Mar 15, 2006·Journal of Biomechanical Engineering·T L NormanV L Kish
Apr 28, 2007·The Journal of Bone and Joint Surgery. British Volume·I UdofiaP Grigoris
Aug 1, 2019·Journal of the Royal Society, Interface·Xing GaoGuillaume Haïat
Sep 29, 2019·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Shuqiao XiePankaj Pankaj
Apr 2, 2014·Language, Speech, and Hearing Services in Schools·Douglas B PetersenJennifer Zebre
Aug 23, 2011·Journal of Shoulder and Elbow Surgery·Dave R ShuklaShawn W O'Driscoll

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