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An in vitro model of impaction during hip arthroplasty

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Title: An in vitro model of impaction during hip arthroplasty
Authors: Doyle, R
Boughton, O
Plant, D
DeSoutter, G
Cobb, J
Jeffers, J
Item Type: Journal Article
Abstract: Impaction is required to properly seat press-fit implants and ensure initial implant stability and long term bone ingrowth, however excessive impaction or press-fit presents a high fracture risk in the acetabulum and femur. Current in-vitro impaction testing methods do not replicate the compliance of the soft tissues surrounding the hip, a factor that may be important in fracture and force prediction. This study presents the measurement of compliance of the soft tissues supporting the hip during impaction in operative conditions, and replicates these in vitro. Hip replacements were carried out on 4 full body cadavers while impact force traces and acetabular/femoral displacement were measured. Compliance was then simulated computationally using a Voigt model. These data were subsequently used to inform the design of a representative in-vitro drop rig. Effective masses of 19.7 kg and 12.7 kg, spring stiffnesses of 8.0 kN/m and 4.1 kN/m and dashpot coefficients of 595 N s/m and 322 N s/m were calculated for the acetabular and femoral soft tissues respectively. A good agreement between cadaveric and in-vitro peak displacement and rise time during impact is found. Such an in-vitro setup is of use during laboratory testing, simulation or even surgical training.
Issue Date: 3-Jan-2019
Date of Acceptance: 24-Oct-2018
URI: http://hdl.handle.net/10044/1/65776
DOI: https://dx.doi.org/10.1016/j.jbiomech.2018.10.030
ISSN: 0021-9290
Publisher: Elsevier
Start Page: 220
End Page: 227
Journal / Book Title: Journal of Biomechanics
Volume: 82
Copyright Statement: © 2018 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Imperial College Healthcare NHS Trust- BRC Funding
National Institute for Health Research
Royal College Of Surgeons Of England
Royal College of Surgeons of England
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/K027549/1
RDB04 79560
NIHR ACF
WSSU_P63898
Matching orthopaedic surgery to patients' individual bone mechanical properties
EP/R042721/1
Keywords: Boundary conditions
Compliance
Hip arthroplasty
Impaction
In-vitro testing
0903 Biomedical Engineering
1106 Human Movement And Sports Science
0913 Mechanical Engineering
Biomedical Engineering
Publication Status: Published
Online Publication Date: 2018-11-01
Appears in Collections:Faculty of Engineering
Mechanical Engineering
Division of Surgery
Faculty of Medicine



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