@article{Doyle:2019:10.1016/j.jbiomech.2018.10.030,
author = {Doyle, R and Boughton, O and Plant, D and DeSoutter, G and Cobb, J and Jeffers, J},
doi = {10.1016/j.jbiomech.2018.10.030},
journal = {Journal of Biomechanics},
pages = {220--227},
title = {An in vitro model of impaction during hip arthroplasty},
url = {http://dx.doi.org/10.1016/j.jbiomech.2018.10.030},
volume = {82},
year = {2019}
}

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TY  - JOUR
AB  - 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 19.7kg and 12.7kg, spring stiffnesses of 8.0kN/m and 4.1kN/m and dashpot coefficients of 595Ns/m and 322Ns/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.
AU  - Doyle,R
AU  - Boughton,O
AU  - Plant,D
AU  - DeSoutter,G
AU  - Cobb,J
AU  - Jeffers,J
DO  - 10.1016/j.jbiomech.2018.10.030
EP  - 227
PY  - 2019///
SN  - 0021-9290
SP  - 220
TI  - An in vitro model of impaction during hip arthroplasty
T2  - Journal of Biomechanics
UR  - http://dx.doi.org/10.1016/j.jbiomech.2018.10.030
UR  - https://www.sciencedirect.com/science/article/pii/S0021929018308078
VL  - 82
ER  - 

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