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Influence of Comprehensive Joint Loads on Tibial Implant Micromotion in Total Ankle Arthroplasty

CATEGORY: Ankle INTRODUCTION/PURPOSE: Biologic fixation of total joint replacements by bone ingrowth requires minimal bone-implant micromotion [1]. Computational finite element (FE) models used to evaluate the interaction between implant and bone typically only consider simplified loading conditions...

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Autores principales: Steineman, Brett D., Demetracopoulos, Constantine A., Deland, Jonathan T., Gonzalez, Fernando Quevedo, Sturnick, Daniel R., Wright, Timothy
Formato: Online Artículo Texto
Lenguaje:English
Publicado: SAGE Publications 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8704849/
http://dx.doi.org/10.1177/2473011420S00084
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author Steineman, Brett D.
Demetracopoulos, Constantine A.
Deland, Jonathan T.
Steineman, Brett D.
Gonzalez, Fernando Quevedo
Sturnick, Daniel R.
Wright, Timothy
author_facet Steineman, Brett D.
Demetracopoulos, Constantine A.
Deland, Jonathan T.
Steineman, Brett D.
Gonzalez, Fernando Quevedo
Sturnick, Daniel R.
Wright, Timothy
author_sort Steineman, Brett D.
collection PubMed
description CATEGORY: Ankle INTRODUCTION/PURPOSE: Biologic fixation of total joint replacements by bone ingrowth requires minimal bone-implant micromotion [1]. Computational finite element (FE) models used to evaluate the interaction between implant and bone typically only consider simplified loading conditions based on the peak compressive force which occurs near toe-off [2,3]. However, a previous study focused on cementless knee replacements demonstrated that peak micromotion during activity cycles occurred with sub-maximal forces and moments [4]. Our objective was to calculate multi-axial loading at the ankle joint throughout level walking and evaluate tibial fixation of ankle replacements under these loading conditions. We hypothesized that peak micromotion would occur with sub-maximal loads and moments instead of at the instant of peak compressive load. METHODS: Our validated six-degree-of-freedom robotic simulator utilizes in vivo data from human subjects to replicate the individual bone kinematics in cadaveric specimen throughout activity [5]. We rigidly fixed retro-reflective markers using bone pins to the tibia, talus, and calcaneus bones of three cadaveric specimens to record individual bone kinematics using motion capture cameras. We recorded the ground reaction and muscle-tendon forces during the simulated stance phase of level walking. Musculoskeletal models were then developed in OpenSim using the specimen-specific morphology and implant position from CT- scans and from the simulator outputs to determine the loading profile at the ankle joint during stance. The calculated loads were then applied to specimen-specific finite element models to evaluate the bone-implant interaction. Peak micromotion at each time point of loading was measured and compared to the loading profile to determine if it corresponded with the peak compressive load. RESULTS: For all specimens, the peak compressive load at the ankle joint was accompanied by multi-axial moments and relatively small shear forces (Figure 1). The peak compressive load for each specimens was between 750 N and 850 N and occurred during 75-80% of gait. The largest moment experienced by all specimens was an internal moment late in stance. The peak micromotion for each specimen did not correspond to the instance of peak compressive load, as indicated in Figure 1. Instead, peak micromotion occurred at 54%, 88%, and 96% of gait. For each specimen, these instances corresponded to the combination of a sub-maximal compressive load with high eversion and internal moments. CONCLUSION: We have developed a workflow to calculate ankle joint loads corresponding to cadaveric simulations that reproduce a daily activity based on in vivo data. The specimen-specific, multi-axial loading profile at the ankle for our initial results suggests that peak micromotion at the bone-implant interface of the tibial implant does not coincide with the peak compressive force. The instant of peak compressive load may not capture the worst-case scenario for the interaction between the implant and the bone. Instead, the multi-axial forces and moments at the ankle joint throughout activity should be considered when evaluating implant fixation.
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spelling pubmed-87048492022-01-28 Influence of Comprehensive Joint Loads on Tibial Implant Micromotion in Total Ankle Arthroplasty Steineman, Brett D. Demetracopoulos, Constantine A. Deland, Jonathan T. Steineman, Brett D. Gonzalez, Fernando Quevedo Sturnick, Daniel R. Wright, Timothy Foot Ankle Orthop Article CATEGORY: Ankle INTRODUCTION/PURPOSE: Biologic fixation of total joint replacements by bone ingrowth requires minimal bone-implant micromotion [1]. Computational finite element (FE) models used to evaluate the interaction between implant and bone typically only consider simplified loading conditions based on the peak compressive force which occurs near toe-off [2,3]. However, a previous study focused on cementless knee replacements demonstrated that peak micromotion during activity cycles occurred with sub-maximal forces and moments [4]. Our objective was to calculate multi-axial loading at the ankle joint throughout level walking and evaluate tibial fixation of ankle replacements under these loading conditions. We hypothesized that peak micromotion would occur with sub-maximal loads and moments instead of at the instant of peak compressive load. METHODS: Our validated six-degree-of-freedom robotic simulator utilizes in vivo data from human subjects to replicate the individual bone kinematics in cadaveric specimen throughout activity [5]. We rigidly fixed retro-reflective markers using bone pins to the tibia, talus, and calcaneus bones of three cadaveric specimens to record individual bone kinematics using motion capture cameras. We recorded the ground reaction and muscle-tendon forces during the simulated stance phase of level walking. Musculoskeletal models were then developed in OpenSim using the specimen-specific morphology and implant position from CT- scans and from the simulator outputs to determine the loading profile at the ankle joint during stance. The calculated loads were then applied to specimen-specific finite element models to evaluate the bone-implant interaction. Peak micromotion at each time point of loading was measured and compared to the loading profile to determine if it corresponded with the peak compressive load. RESULTS: For all specimens, the peak compressive load at the ankle joint was accompanied by multi-axial moments and relatively small shear forces (Figure 1). The peak compressive load for each specimens was between 750 N and 850 N and occurred during 75-80% of gait. The largest moment experienced by all specimens was an internal moment late in stance. The peak micromotion for each specimen did not correspond to the instance of peak compressive load, as indicated in Figure 1. Instead, peak micromotion occurred at 54%, 88%, and 96% of gait. For each specimen, these instances corresponded to the combination of a sub-maximal compressive load with high eversion and internal moments. CONCLUSION: We have developed a workflow to calculate ankle joint loads corresponding to cadaveric simulations that reproduce a daily activity based on in vivo data. The specimen-specific, multi-axial loading profile at the ankle for our initial results suggests that peak micromotion at the bone-implant interface of the tibial implant does not coincide with the peak compressive force. The instant of peak compressive load may not capture the worst-case scenario for the interaction between the implant and the bone. Instead, the multi-axial forces and moments at the ankle joint throughout activity should be considered when evaluating implant fixation. SAGE Publications 2020-11-06 /pmc/articles/PMC8704849/ http://dx.doi.org/10.1177/2473011420S00084 Text en © The Author(s) 2020 https://creativecommons.org/licenses/by-nc/4.0/This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).
spellingShingle Article
Steineman, Brett D.
Demetracopoulos, Constantine A.
Deland, Jonathan T.
Steineman, Brett D.
Gonzalez, Fernando Quevedo
Sturnick, Daniel R.
Wright, Timothy
Influence of Comprehensive Joint Loads on Tibial Implant Micromotion in Total Ankle Arthroplasty
title Influence of Comprehensive Joint Loads on Tibial Implant Micromotion in Total Ankle Arthroplasty
title_full Influence of Comprehensive Joint Loads on Tibial Implant Micromotion in Total Ankle Arthroplasty
title_fullStr Influence of Comprehensive Joint Loads on Tibial Implant Micromotion in Total Ankle Arthroplasty
title_full_unstemmed Influence of Comprehensive Joint Loads on Tibial Implant Micromotion in Total Ankle Arthroplasty
title_short Influence of Comprehensive Joint Loads on Tibial Implant Micromotion in Total Ankle Arthroplasty
title_sort influence of comprehensive joint loads on tibial implant micromotion in total ankle arthroplasty
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8704849/
http://dx.doi.org/10.1177/2473011420S00084
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