Effect of bearing type on taper material loss in hips from 1 manufacturer

Harry S. Hothi; Antti P. Eskelinen; Johann Henckel; Young-Min Kwon; Gordon W. Blunn; John A. Skinner; Alister J. Hart

doi:10.1016/j.arth.2017.12.022

Effect of bearing type on taper material loss in hips from 1 manufacturer

Harry S. Hothi, Antti P. Eskelinen, Johann Henckel, Young-Min Kwon, Gordon W. Blunn, John A. Skinner, Alister J. Hart

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Abstract

Background - Numerous studies have reported on clinical significant volumes of material loss and corrosion at the head-stem junction of metal-on-metal (MOM) hips; less is understood about metal-on-polyethylene (MOP) hips. We compared the effect of bearing type (MOM vs MOP) on taper material loss for a hip system of a single design.

Methods - In this cohort study, we recruited retrieved MOM (n = 30) and MOP (n = 22) bearing hips that were consecutively received at our center. We prospectively collected associated clinical and imaging data. We measured the severity of corrosion and volumes of material loss at each head taper surface and used multivariate statistical analysis to investigate differences between the 2 bearing types.

Results - The median rate of material loss for the MOM and MOP groups was 0.81 mm3/y (0.01-3.45) and 0.03 mm3/y (0-1.07), respectively (P < .001). Twenty-nine of 30 MOM hips were revised for adverse metal reactions, compared with 1 of 22 MOP hips.

Conclusion - MOP hips lost significantly less material from their taper junctions than MOM hips. Our results can reassure patients with MOP Pinnacle hips that they are unlikely to experience clinically significant problems related to material loss from the taper junction.

Original language	English
Pages (from-to)	1588-1593
Journal	The Journal of Arthroplasty
Volume	33
Issue number	5
Early online date	29 Dec 2017
DOIs	https://doi.org/10.1016/j.arth.2017.12.022
Publication status	Published - 1 May 2018

Keywords

Hip
Taper
Metal-on-polyethylene
Corrosion
Wear

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10.1016/j.arth.2017.12.022

Effect of Bearing TypeAccepted author manuscript (Post-print), 4.54 MBLicence: CC BY-NC-ND

Cite this

@article{a08fa3f955514dd0b1760e4c90b7c9aa,

title = "Effect of bearing type on taper material loss in hips from 1 manufacturer",

abstract = "Background - Numerous studies have reported on clinical significant volumes of material loss and corrosion at the head-stem junction of metal-on-metal (MOM) hips; less is understood about metal-on-polyethylene (MOP) hips. We compared the effect of bearing type (MOM vs MOP) on taper material loss for a hip system of a single design.Methods - In this cohort study, we recruited retrieved MOM (n = 30) and MOP (n = 22) bearing hips that were consecutively received at our center. We prospectively collected associated clinical and imaging data. We measured the severity of corrosion and volumes of material loss at each head taper surface and used multivariate statistical analysis to investigate differences between the 2 bearing types.Results - The median rate of material loss for the MOM and MOP groups was 0.81 mm3/y (0.01-3.45) and 0.03 mm3/y (0-1.07), respectively (P < .001). Twenty-nine of 30 MOM hips were revised for adverse metal reactions, compared with 1 of 22 MOP hips.Conclusion - MOP hips lost significantly less material from their taper junctions than MOM hips. Our results can reassure patients with MOP Pinnacle hips that they are unlikely to experience clinically significant problems related to material loss from the taper junction.",

keywords = "Hip, Taper, Metal-on-polyethylene, Corrosion, Wear",

author = "Hothi, {Harry S.} and Eskelinen, {Antti P.} and Johann Henckel and Young-Min Kwon and Blunn, {Gordon W.} and Skinner, {John A.} and Hart, {Alister J.}",

year = "2018",

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doi = "10.1016/j.arth.2017.12.022",

language = "English",

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journal = "The Journal of Arthroplasty",

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TY - JOUR

T1 - Effect of bearing type on taper material loss in hips from 1 manufacturer

AU - Hothi, Harry S.

AU - Eskelinen, Antti P.

AU - Henckel, Johann

AU - Kwon, Young-Min

AU - Blunn, Gordon W.

AU - Skinner, John A.

AU - Hart, Alister J.

PY - 2018/5/1

Y1 - 2018/5/1

N2 - Background - Numerous studies have reported on clinical significant volumes of material loss and corrosion at the head-stem junction of metal-on-metal (MOM) hips; less is understood about metal-on-polyethylene (MOP) hips. We compared the effect of bearing type (MOM vs MOP) on taper material loss for a hip system of a single design.Methods - In this cohort study, we recruited retrieved MOM (n = 30) and MOP (n = 22) bearing hips that were consecutively received at our center. We prospectively collected associated clinical and imaging data. We measured the severity of corrosion and volumes of material loss at each head taper surface and used multivariate statistical analysis to investigate differences between the 2 bearing types.Results - The median rate of material loss for the MOM and MOP groups was 0.81 mm3/y (0.01-3.45) and 0.03 mm3/y (0-1.07), respectively (P < .001). Twenty-nine of 30 MOM hips were revised for adverse metal reactions, compared with 1 of 22 MOP hips.Conclusion - MOP hips lost significantly less material from their taper junctions than MOM hips. Our results can reassure patients with MOP Pinnacle hips that they are unlikely to experience clinically significant problems related to material loss from the taper junction.

AB - Background - Numerous studies have reported on clinical significant volumes of material loss and corrosion at the head-stem junction of metal-on-metal (MOM) hips; less is understood about metal-on-polyethylene (MOP) hips. We compared the effect of bearing type (MOM vs MOP) on taper material loss for a hip system of a single design.Methods - In this cohort study, we recruited retrieved MOM (n = 30) and MOP (n = 22) bearing hips that were consecutively received at our center. We prospectively collected associated clinical and imaging data. We measured the severity of corrosion and volumes of material loss at each head taper surface and used multivariate statistical analysis to investigate differences between the 2 bearing types.Results - The median rate of material loss for the MOM and MOP groups was 0.81 mm3/y (0.01-3.45) and 0.03 mm3/y (0-1.07), respectively (P < .001). Twenty-nine of 30 MOM hips were revised for adverse metal reactions, compared with 1 of 22 MOP hips.Conclusion - MOP hips lost significantly less material from their taper junctions than MOM hips. Our results can reassure patients with MOP Pinnacle hips that they are unlikely to experience clinically significant problems related to material loss from the taper junction.

KW - Hip

KW - Taper

KW - Metal-on-polyethylene

KW - Corrosion

KW - Wear

UR - http://discovery.ucl.ac.uk/10046747/

U2 - 10.1016/j.arth.2017.12.022

DO - 10.1016/j.arth.2017.12.022

M3 - Article

C2 - 29370957

SN - 0883-5403

VL - 33

SP - 1588

EP - 1593

JO - The Journal of Arthroplasty

JF - The Journal of Arthroplasty

IS - 5

ER -

Effect of bearing type on taper material loss in hips from 1 manufacturer

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