Developments in Modelling Bone Screwing

INTRODUCTION: A torque-rotation model of the bone-screwing process has been proposed. Identification of model parameters using recorded data could potentially be used to determine the material properties of bone. These properties can then be used to recommend tightening torques to avoid over or unde...

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Autores principales:	Wilkie Jack, Docherty Paul D., Möller Knut
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2020
Materias:	orthopaedic surgery self-tapping screw smart screwdriver bone modelling parameter identification Medicine R
Acceso en línea:	https://doaj.org/article/19721d3ffc2f4c05be4865e28a6d7263
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spelling	oai:doaj.org-article:19721d3ffc2f4c05be4865e28a6d72632021-12-05T14:10:42ZDevelopments in Modelling Bone Screwing2364-550410.1515/cdbme-2020-3029https://doaj.org/article/19721d3ffc2f4c05be4865e28a6d72632020-09-01T00:00:00Zhttps://doi.org/10.1515/cdbme-2020-3029https://doaj.org/toc/2364-5504INTRODUCTION: A torque-rotation model of the bone-screwing process has been proposed. Identification of model parameters using recorded data could potentially be used to determine the material properties of bone. These properties can then be used to recommend tightening torques to avoid over or under-tightening of bone screws. This paper improves an existing model to formulate it in terms of material properties and remove some assumptions. METHOD: The modelling methodology considers a critical torque, which is required to overcome friction and advance the screw into the bone. Below this torque the screw may rotate with elastic deformation of the bone tissue, and above this the screw moves relative to the bone, and the speed is governed by a speed-torque model of the operator’s hand. The model is formulated in terms of elastic modulus, ultimite tensile strength, and frictional coefficient of the bone and the geometry of the screw and hole. RESULTS: The model output shows the speed decreasing and torque increasing as the screw advances into the bone, due to increasing resistance. The general shape of the torque and speed follow the input effort. Compared with the existing model, this model removes the assumption of viscous friction, models the increase in friction as the screw advances into the bone, and is directly in terms of the bone material properties. CONCLUSION: The model presented makes significant improvements on the existing model. However it is intended for use in parameter identification, which was not evaluated here. Further simulation and experimental validation is required to establish the accuracy and fitness of this model for identifying bone material properties.Wilkie JackDocherty Paul D.Möller KnutDe Gruyterarticleorthopaedic surgeryself-tapping screwsmart screwdriverbone modellingparameter identificationMedicineRENCurrent Directions in Biomedical Engineering, Vol 6, Iss 3, Pp 111-114 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	orthopaedic surgery self-tapping screw smart screwdriver bone modelling parameter identification Medicine R
spellingShingle	orthopaedic surgery self-tapping screw smart screwdriver bone modelling parameter identification Medicine R Wilkie Jack Docherty Paul D. Möller Knut Developments in Modelling Bone Screwing
description	INTRODUCTION: A torque-rotation model of the bone-screwing process has been proposed. Identification of model parameters using recorded data could potentially be used to determine the material properties of bone. These properties can then be used to recommend tightening torques to avoid over or under-tightening of bone screws. This paper improves an existing model to formulate it in terms of material properties and remove some assumptions. METHOD: The modelling methodology considers a critical torque, which is required to overcome friction and advance the screw into the bone. Below this torque the screw may rotate with elastic deformation of the bone tissue, and above this the screw moves relative to the bone, and the speed is governed by a speed-torque model of the operator’s hand. The model is formulated in terms of elastic modulus, ultimite tensile strength, and frictional coefficient of the bone and the geometry of the screw and hole. RESULTS: The model output shows the speed decreasing and torque increasing as the screw advances into the bone, due to increasing resistance. The general shape of the torque and speed follow the input effort. Compared with the existing model, this model removes the assumption of viscous friction, models the increase in friction as the screw advances into the bone, and is directly in terms of the bone material properties. CONCLUSION: The model presented makes significant improvements on the existing model. However it is intended for use in parameter identification, which was not evaluated here. Further simulation and experimental validation is required to establish the accuracy and fitness of this model for identifying bone material properties.
format	article
author	Wilkie Jack Docherty Paul D. Möller Knut
author_facet	Wilkie Jack Docherty Paul D. Möller Knut
author_sort	Wilkie Jack
title	Developments in Modelling Bone Screwing
title_short	Developments in Modelling Bone Screwing
title_full	Developments in Modelling Bone Screwing
title_fullStr	Developments in Modelling Bone Screwing
title_full_unstemmed	Developments in Modelling Bone Screwing
title_sort	developments in modelling bone screwing
publisher	De Gruyter
publishDate	2020
url	https://doaj.org/article/19721d3ffc2f4c05be4865e28a6d7263
work_keys_str_mv	AT wilkiejack developmentsinmodellingbonescrewing AT dochertypauld developmentsinmodellingbonescrewing AT mollerknut developmentsinmodellingbonescrewing
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Developments in Modelling Bone Screwing

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