Corrosion on the Acetabular Liner Taper from Retrieved Modular Metal-on-Metal Total Hip Replacements

Gascoyne, Trevor C.; Dyrkacz, Richard; Turgeon, Thomas R.; Burnell, Colin; Wyss, Urs P.; Brandt, J.

doi:10.1016/j.arth.2014.05.027

Cited by 25 publications

(15 citation statements)

References 20 publications

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“…Our observations are in agreement with those reported by Gascoyne et al [10], who examined 8 cases, revealing clear evidence of corrosion at the shell-liner junction.…”

Section: Discussionsupporting

confidence: 95%

“…However the extent of corrosion damage at the interface between the liner and shell of metal modular cups and the clinical significance of this are currently less clear. Higgs et al [4] reported evidence of scratching and discolouration at rim of the backside of the CoCr liner in a series of 18 cups; considerable pitting and black corrosive debris were also observed at the rim by Gascoyne et al [10] in approximately 25% of their series of retrievals.The aim of this study was: (1) to determine, using visual analysis and detailed surface assessment methods, the severity and location of corrosion on the backside of metal liners in a consecutive series of retrieved hips with two different cup designs: DePuy Pinnacle and Smith & Nephew R3 and (2) determine if there were any differences in corrosion between the two designs. …”

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confidence: 93%

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confidence: 93%

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Corrosion of Metal Modular Cup Liners

Hothi

Ilo

Whittaker

et al. 2015

The Journal of Arthroplasty

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“…Our observations are in agreement with those reported by Gascoyne et al [10], who examined 8 cases, revealing clear evidence of corrosion at the shell-liner junction.…”

Section: Discussionsupporting

confidence: 95%

mentioning

confidence: 93%

mentioning

confidence: 93%

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Corrosion of Metal Modular Cup Liners

Hothi

Ilo

Whittaker

et al. 2015

The Journal of Arthroplasty

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“…Recent retrieval studies have shown that modular acetabular components, primarily associated with MoM designs, sustain damage in their taper junctions, usually attributed to mechanically‐assisted crevice corrosion (MACC) and wear . However, the nature of the damage observed in these tapers is distinctly different than that seen in, for example, head‐neck junctions.…”

Section: Introductionmentioning

confidence: 99%

“…However, the nature of the damage observed in these tapers is distinctly different than that seen in, for example, head‐neck junctions. It is often not directly based on fretting/mechanical damage, but rather appears to be intergranular in nature and arises from non‐mechanically‐based crevice corrosion or other corrosion‐based mechanisms.…”

Section: Introductionmentioning

confidence: 99%

In vitro test methods for seating and fretting corrosion behavior of modular metal‐on‐metal acetabular tapers

Shenoy

Gilbert

2019

Journal Orthopaedic Research

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Retrieval studies show that metal-on-metal acetabular shell-liner tapers are susceptible to corrosion, which is hypothesized to arise from mechanically-assisted crevice corrosion (MACC). The role of materials on MACC of acetabular tapers has not been previously studied. In vitro tests of seating, pushout, and fretting corrosion performance of acetabular tapers are presented to assess the role of material combinations (Ti-6Al-4V shells, HC CoCrMo, LC CoCrMo, and 316L SS liners). The acetabular tapers were wetassembled to a seating load of 1,000 N. The liner load-displacement seating mechanics were measured. Fretting corrosion currents were evaluated using a uniaxial incremental cyclic compression test up to 4,000 N, with the load applied at a 55°angle to the taper interface. Fretting currents, fretting onset loads, taper disengagement strength were measured and load-displacement plots were obtained. Pushout tests were also performed pre-and post-fretting corrosion. The average liner seating displacements varied from 134 to 226 μm across groups. Fretting currents at 3,600 N cyclic load were low and ranged between 0.05 and 0.27 μA and were independent of material combination (p > 0.05), reflecting small amounts of fretting. Fretting corrosion onset loads were between 1,800 and 2,100 N, and did not differ across groups (p > 0.05). Pushout loads were 27-43% of the maximum load applied. Fretting corrosion levels were very low for all material combinations and not different from one another. The seating and pushout responses were also not material dependent. The low fretting currents measured imply that MACC may not be a major cause for acetabular taper corrosion.

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Nontribological corrosion modes dominate wrought CoCrMo acetabular taper corrosion: A retrieval study

2021

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Corrosion of modular metal-on-metal acetabular tapers in total hip arthroplasty (THA) systems is often attributed to mechanically driven processes. Recent findings suggest that mechanically assisted crevice corrosion (MACC) might not be the dominant cause of corrosion in shell-liner tapers. This study aims to document and present the corrosion modes observed in metal-metal acetabular liners. Twenty-one retrieved wrought CoCrMo liners were examined using digital optical microscopy (DOM), scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDS). Corrosion-related damage was documented in nonengagement taper regions, outside of direct taper contact. Within engagement regions, nonmechanically driven corrosion features (pitting, intergranular corrosion) were observed adjacent to fretting and material transfer, which rely on mechanical contact; corrosion independent of MACC was observed even in contact regions. Corrosion types observed included intergranular corrosion (IGC), pitting attack, phase boundary dissolution, all both outside and inside of taper junctions, and MACC within contact regions of the taper. Typical fretting scars associated with MACC were mostly absent, and were not always associated with corrosion damage where present. Finally, hard phase particles (Mo-Si-O) released from the wrought CoCrMo microstructure had redeposited within regions with material loss. Acetabular taper corrosion modes differ significantly from those in head-neck tapers and are dominated by electrochemically driven processes, not mechanical processes, as indicated by corrosion in noncontact regions. With greater prevalence of dual mobility hip implants, acetabular taper corrosion processes must be understood in order to limit their impact on device performance.

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Corrosion on the Acetabular Liner Taper from Retrieved Modular Metal-on-Metal Total Hip Replacements

Cited by 25 publications

References 20 publications

Corrosion of Metal Modular Cup Liners

Corrosion of Metal Modular Cup Liners

In vitro test methods for seating and fretting corrosion behavior of modular metal‐on‐metal acetabular tapers

Nontribological corrosion modes dominate wrought CoCrMo acetabular taper corrosion: A retrieval study

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