Investigation on stick phenomena in metal-on-metal hip joints after resting periods

Wimmer, Matthias; Nassutt, R.; Sprecher, Christoph M.; Loos, Jörg; Täger, G.; Fischer, Alfons

doi:10.1243/09544119jeim117

Cited by 28 publications

(33 citation statements)

References 26 publications

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“…As was shown earlier,23 thick denatured protein layers might stick rigidly onto the passive layer of cobalt alloys. Because chromium‐oxide forms in a moist environment, this is expected and was verified using XPS (data not shown).…”

Section: Resultssupporting

confidence: 58%

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Wear mechanisms in metal-on-metal bearings: The importance of tribochemical reaction layers

et al. 2009

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Metal-on-metal (MoM) bearings are at the forefront in hip resurfacing arthroplasty. Because of their good wear characteristics and design flexibility, MoM bearings are gaining wider acceptance with market share reaching nearly 10% worldwide. However, concerns remain regarding potential detrimental effects of metal particulates and ion release. Growing evidence is emerging that the local cell response is related to the amount of debris generated by these bearing couples. Thus, an urgent clinical need exists to delineate the mechanisms of debris generation to further reduce wear and its adverse effects. In this study, we investigated the microstructural and chemical composition of the tribochemical reaction layers forming at the contacting surfaces of metallic bearings during sliding motion. Using X-ray photoelectron spectroscopy and transmission electron microscopy with coupled energy dispersive X-ray and electron energy loss spectroscopy, we found that the tribolayers are nanocrystalline in structure, and that they incorporate organic material stemming from the synovial fluid. This process, which has been termed ''mechanical mixing,'' changes the bearing surface of the uppermost 50 to 200 nm from pure metallic to an organic composite material. It hinders direct metal contact (thus preventing adhesion) and limits wear. This novel finding of a mechanically mixed zone of nanocrystalline metal and organic constituents provides the basis for understanding particle release and may help in identifying new strategies to reduce MoM wear. ß

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Section: Resultssupporting

confidence: 58%

“…In turn, these complexes are adsorbed onto the metallic surfaces 35. These protein layers adhere rigidly to the surfaces23 and are typically found on passive metal films 17…”

Section: Discussionmentioning

confidence: 99%

Wear mechanisms in metal-on-metal bearings: The importance of tribochemical reaction layers

et al. 2009

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“…It was shown that the larger diameter bearing generated a lower friction factor than the 28 mm bearing under all test conditions, although this was not significant. This differs from Wimmer et al [10] who assumed a similar friction factor for metal-on-metal bearings with different diameters. Such a discrepancy can be readily explained from the fluid-film lubrication contribution.…”

Section: Discussioncontrasting

confidence: 56%

“…In vitro studies have demonstrated the low-wearing behaviour of the metal-on-metal bearing [7,8], and clinical studies have also demonstrated favourable results [9]. The frictional torques generated within the new generation bearings are less than those required to cause mechanical loosening [10,11].…”

Section: Introductionmentioning

confidence: 99%

A comparison of friction in 28 mm conventional and 55 mm resurfacing metal-on-metal hip replacements

Brockett

Williams

Zhang

et al. 2007

Proceedings of the Institution of Mechanical Engineers, Part J:

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Total hip replacement has been a common, successful surgical intervention for many years. However, it has long been considered unsatisfactory for younger, more active patients due to the limited survivorship of conventional implants employing polyethylene. Larger resurfacing implants were developed to preserve bone stock and improve stability, however, early metal-on-polyethylene implants failed due to high wear. More recent developments, utilizing a metal-on-metal bearing, have encouraging short-to medium-term clinical performance. Concerns exist regarding the increased sliding distance and frictional torque generated within a larger diameter bearing. A large diameter metal-on-metal surface replacement was contrasted with a conventional 28 mm diameter implant with the same bearing material combination using a pendulum friction simulator. Studies were performed under different swing-phase load and lubrication conditions. The larger diameter bearing exhibited the lower friction factor under all test conditions, although the measured frictional torque was higher. Increasing swing-phase load was shown to cause an increase in friction factor in all tests. Increased serum concentration resulted in a reduction in friction factor for both bearings. Variation of the friction factor with the head diameter suggested that fluid-film lubrication contributed to the reduction of friction.

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“…The torques calculated in this study act in the medial lateral (frontal) plane, which is perpendicular to the frictional torque due to flexion extension movement in the anterior-posterior plane. 22,23 The relative stability of the cup and resistance to loosening in these two planes are not known. Head-rim contact and edge loading may also cause micro-motion of the cup, which may give rise to increased cup inclination, and subsequently affect head-rim contact and further the stability of the fixation.…”

Section: Discussionmentioning

confidence: 99%

Effect of head contact on the rim of the cup on the offset loading and torque in hip joint replacement

Williams

Zhang

et al. 2013

Proc Inst Mech Eng H

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Head contact on the rim of the cup causes stress concentration and consequently increased wear. The head contact on the rim of the cup may in addition cause an offset load and torque on the cup. The head-rim contact resulting from microseparation or subluxation has been investigated. An analytical model has been developed to calculate the offset loading and resultant torque on the cup as a function of the translational displacement of the head under simplified loading condition of the hip joint at heel strike during a walking cycle. The magnitude of the torque on the cup was found to increase with the increasing translational displacement, larger diameter heads, eccentric cups, and the coefficient of friction of the contact. The effects of cup inclination, cup rim radius, and cup coverage angle on the magnitude of the torque were found to be relatively small with a maximum variation in the torque magnitude being lower than 20%. This study has shown an increased torque due to the head loading on the rim of the cup, and this may contribute to the incidence of cup loosening. Particularly, metal-on-metal hip joints with larger head diameters may produce the highest offset loading torque.

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Investigation on stick phenomena in metal-on-metal hip joints after resting periods

Cited by 28 publications

References 26 publications

Wear mechanisms in metal-on-metal bearings: The importance of tribochemical reaction layers

Wear mechanisms in metal-on-metal bearings: The importance of tribochemical reaction layers

A comparison of friction in 28 mm conventional and 55 mm resurfacing metal-on-metal hip replacements

Effect of head contact on the rim of the cup on the offset loading and torque in hip joint replacement

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