Effect of head size and rotation on taper corrosion in a hip simulator

Aims: This study investigates head-neck taper corrosion with varying head size in a novel hip simulator instrumented to measure corrosion related electrical activity under torsional loads. Methods: In all, six 28 mm and six 36 mm titanium stem-cobalt chrome head pairs with polyethylene sockets were...

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Autores principales:	Christian M. Wight, Cari M. Whyne, Earl R. Bogoch, Radovan Zdero, Ryan M. Chapman, Douglas W. van Citters, William R. Walsh, Emil Schemitsch
Formato:	article
Lenguaje:	EN
Publicado:	The British Editorial Society of Bone & Joint Surgery 2021
Materias:	fretting corrosion hip simulator metal-on-polyethylene total hip arthroplasty frictional torque polyethylene head-neck taper corrosion cobalt chrome head titanium stem femoral head anova metals larger femoral heads Orthopedic surgery RD701-811
Acceso en línea:	https://doaj.org/article/a0f37f595f4e4d1ab596c0497ba752f8
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spelling	oai:doaj.org-article:a0f37f595f4e4d1ab596c0497ba752f82021-12-01T18:44:47ZEffect of head size and rotation on taper corrosion in a hip simulator2633-146210.1302/2633-1462.211.BJO-2021-0147.R1https://doaj.org/article/a0f37f595f4e4d1ab596c0497ba752f82021-11-01T00:00:00Zhttps://online.boneandjoint.org.uk/doi/epdf/10.1302/2633-1462.211.BJO-2021-0147.R1https://doaj.org/toc/2633-1462Aims: This study investigates head-neck taper corrosion with varying head size in a novel hip simulator instrumented to measure corrosion related electrical activity under torsional loads. Methods: In all, six 28 mm and six 36 mm titanium stem-cobalt chrome head pairs with polyethylene sockets were tested in a novel instrumented hip simulator. Samples were tested using simulated gait data with incremental increasing loads to determine corrosion onset load and electrochemical activity. Half of each head size group were then cycled with simulated gait and the other half with gait compression only. Damage was measured by area and maximum linear wear depth. Results: Overall, 36 mm heads had lower corrosion onset load (p = 0.009) and change in open circuit potential (OCP) during simulated gait with (p = 0.006) and without joint movement (p = 0.004). Discontinuing gait’s joint movement decreased corrosion currents (p = 0.042); however, wear testing showed no significant effect of joint movement on taper damage. In addition, 36 mm heads had greater corrosion area (p = 0.050), but no significant difference was found for maximum linear wear depth (p = 0.155). Conclusion: Larger heads are more susceptible to taper corrosion; however, not due to frictional torque as hypothesized. An alternative hypothesis of taper flexural rigidity differential is proposed. Further studies are necessary to investigate the clinical significance and underlying mechanism of this finding. Cite this article: Bone Jt Open 2021;2(11):1004–1016.Christian M. WightCari M. WhyneEarl R. BogochRadovan ZderoRyan M. ChapmanDouglas W. van CittersWilliam R. WalshEmil SchemitschThe British Editorial Society of Bone & Joint Surgeryarticlefrettingcorrosionhip simulatormetal-on-polyethylenetotal hip arthroplastyfrictional torquepolyethylenehead-neck taper corrosioncobalt chrome headtitanium stemfemoral headanovametal-on-polyethylenemetalslarger femoral headsOrthopedic surgeryRD701-811ENBone & Joint Open, Vol 2, Iss 11, Pp 1004-1016 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	fretting corrosion hip simulator metal-on-polyethylene total hip arthroplasty frictional torque polyethylene head-neck taper corrosion cobalt chrome head titanium stem femoral head anova metal-on-polyethylene metals larger femoral heads Orthopedic surgery RD701-811
spellingShingle	fretting corrosion hip simulator metal-on-polyethylene total hip arthroplasty frictional torque polyethylene head-neck taper corrosion cobalt chrome head titanium stem femoral head anova metal-on-polyethylene metals larger femoral heads Orthopedic surgery RD701-811 Christian M. Wight Cari M. Whyne Earl R. Bogoch Radovan Zdero Ryan M. Chapman Douglas W. van Citters William R. Walsh Emil Schemitsch Effect of head size and rotation on taper corrosion in a hip simulator
description	Aims: This study investigates head-neck taper corrosion with varying head size in a novel hip simulator instrumented to measure corrosion related electrical activity under torsional loads. Methods: In all, six 28 mm and six 36 mm titanium stem-cobalt chrome head pairs with polyethylene sockets were tested in a novel instrumented hip simulator. Samples were tested using simulated gait data with incremental increasing loads to determine corrosion onset load and electrochemical activity. Half of each head size group were then cycled with simulated gait and the other half with gait compression only. Damage was measured by area and maximum linear wear depth. Results: Overall, 36 mm heads had lower corrosion onset load (p = 0.009) and change in open circuit potential (OCP) during simulated gait with (p = 0.006) and without joint movement (p = 0.004). Discontinuing gait’s joint movement decreased corrosion currents (p = 0.042); however, wear testing showed no significant effect of joint movement on taper damage. In addition, 36 mm heads had greater corrosion area (p = 0.050), but no significant difference was found for maximum linear wear depth (p = 0.155). Conclusion: Larger heads are more susceptible to taper corrosion; however, not due to frictional torque as hypothesized. An alternative hypothesis of taper flexural rigidity differential is proposed. Further studies are necessary to investigate the clinical significance and underlying mechanism of this finding. Cite this article: Bone Jt Open 2021;2(11):1004–1016.
format	article
author	Christian M. Wight Cari M. Whyne Earl R. Bogoch Radovan Zdero Ryan M. Chapman Douglas W. van Citters William R. Walsh Emil Schemitsch
author_facet	Christian M. Wight Cari M. Whyne Earl R. Bogoch Radovan Zdero Ryan M. Chapman Douglas W. van Citters William R. Walsh Emil Schemitsch
author_sort	Christian M. Wight
title	Effect of head size and rotation on taper corrosion in a hip simulator
title_short	Effect of head size and rotation on taper corrosion in a hip simulator
title_full	Effect of head size and rotation on taper corrosion in a hip simulator
title_fullStr	Effect of head size and rotation on taper corrosion in a hip simulator
title_full_unstemmed	Effect of head size and rotation on taper corrosion in a hip simulator
title_sort	effect of head size and rotation on taper corrosion in a hip simulator
publisher	The British Editorial Society of Bone & Joint Surgery
publishDate	2021
url	https://doaj.org/article/a0f37f595f4e4d1ab596c0497ba752f8
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Effect of head size and rotation on taper corrosion in a hip simulator

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