Monitoring cementless femoral stem insertion by impact analyses: An in vitro study

Journal of the Mechanical Behavior of Biomedical Materials
Antoine TijouGuillaume Haïat

Abstract

The primary stability of the femoral stem (FS) implant determines the surgical success of cementless hip arthroplasty. During the insertion, a compromise must be found for the number and energy of impacts that should be sufficiently large to obtain an adapted primary stability of the FS and not too high to decrease fracture risk. The aim of this study is to determine whether a hammer instrumented with a force sensor can be used to monitor the insertion of FS. Cementless FS of different sizes were impacted in four artificial femurs with an instrumented hammer, leading to 72 configurations. The impact number when the surgeon empirically felt that the FS was fully inserted was noted Nsurg. The insertion depth E was assessed using video motion tracking and the impact number Nvid corresponding to the end of the insertion was estimated. For each impact, two indicators noted I and D were determined based on the analysis of the variation of the force as a function of time. The pull-out force F was significantly correlated with the indicator I (R2 = 0.67). The variation of D was analyzed using a threshold to determine an impact number Nd, which is shown to be closely related to Nsurg and Nvid, with an average difference of around 0.2. T...Continue Reading

Citations

Aug 1, 2019·Journal of the Royal Society, Interface·Xing GaoGuillaume Haïat
Sep 12, 2020·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Christian KlemtYoung-Min Kwon
Aug 28, 2020·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Quentin GoossensKathleen Denis
Oct 4, 2019·Scientific Reports·Yoann HériveauxGuillaume Haïat
Feb 2, 2020·Journal of Biomechanical Engineering·Alexis HubertGuillaume Haiat
Nov 30, 2019·Journal of the Mechanical Behavior of Biomedical Materials·Arnaud DuboryGuillaume Haïat
May 11, 2020·Clinical Biomechanics·Hugues Albini LomamiGuillaume Haiat

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