Acetabular Cups in 60 mm Metal-on-Metal Bearings Subjected to Dynamic Edge-Loading with 70° Peak-Inclination in 10-Million Cycle Simulator Study

Clarke, Ian C.; Halim, Thomas; Smith, Ella Thea; Donaldson, Thomas

doi:10.3390/lubricants6010001

Cited by 3 publications

(4 citation statements)

References 57 publications

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“…Pre-clinical wear testing remained to be one of the most important considerations, with the major focuses on developing more realistic and more predictive experimental environments such as under adverse conditions. This was found to be particularly important for metal-on-metal hard contacts [347,348]. The importance of adverse testing in the knee implant was addressed for various alignments and soft tissue conditions [349].…”

Section: Joint Tribologymentioning

confidence: 99%

A review of recent advances in tribology

et al. 2020

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The reach of tribology has expanded in diverse fields and tribology related research activities have seen immense growth during the last decade. This review takes stock of the recent advances in research pertaining to different aspects of tribology within the last 2 to 3 years. Different aspects of tribology that have been reviewed including lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology. This review attempts to highlight recent research and also presents future outlook pertaining to these aspects. It may however be noted that there are limitations of this review. One of the most important of these is that tribology being a highly multidisciplinary field, the research results are widely spread across various disciplines and there can be omissions because of this. Secondly, the topics dealt with in the field of tribology include only some of the salient topics (such as lubrication, wear, surface engineering, biotribology, high temperature tribology, and computational tribology) but there are many more aspects of tribology that have not been covered in this review. Despite these limitations it is hoped that such a review will bring the most recent salient research in focus and will be beneficial for the growing community of tribology researchers.

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Section: Joint Tribologymentioning

confidence: 99%

A review of recent advances in tribology

et al. 2020

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“…According to literature review the wear-pattern from heads to cup is in the middle upper point with elliptical area of 1668 mm 2 spread to one side. Also, the acetabular cup has three wear patterns areas of 442 mm 2 eccentric of the main axis at inclinations of 35 O , 50 O and 60 O [7].…”

Section: Discussionmentioning

confidence: 99%

Manufacturing of 3 Axis Hip Simulator

Galanis,

Roussi,

Kitsou

et al. 2023

Preprint

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Hip joint surgeries, including total hip replacement or resurfacing, have increased tremendously in the last decades. Number of patients of all ages, replace their hip, due to severe injuries or trauma problems, so as to have a better life. According to these factors, new material and processes in implants manufacturing are imported to medicine, through research programs, every year. In the scope of one of these programs, that has to do with ceramic coatings on metallic resurfacing implants, a new 3axis Hip simulator was designed and manufactured in the Laboratory of Manufacturing Technology of the National Technical University of Athens. The scope of this paper is to present the main parts, materials and process used to manufacture the simulator as well as the way the simulator is working and how its movement in 3axis is accomplished. Furthermore, the evaluation of the machine and its use to examine resurfacing implants is presented.

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“…However, with hip impingement and subluxation there remains the risk of the femoral head being damaged. It is to be noted that laboratory simulations of steeply-inclined cups[20] [64] did not produce black lubricants or the adverse MOM wear described clinically. In contrast, introduction of metal particles in each ¼-million cycle interval of our MOM debris studies immediately turned the yellow lubricants black[83].…”

mentioning

confidence: 86%

“…The prior study of McKee-Farrar THA had the advantage that the femoral components represented a monoblock design [40]. To determine in-vivo positioning of modular bearings, we utilized wear-pattern mapping developed from simulator studies [21] [63] [64]. This unique approach defined component wear-patterns using a combination of light microscopy, white light interferometry (WLI: NewView-600, ZygoInc, Tucson, AZ), and scanning electron microscopy (SEM: MA-15: Zeiss Inc., New York).…”

Section: Wear Patterns Defining In-vivo Component Positionsmentioning

confidence: 99%

Adverse Wear in MOM Hip-Arthroplasty Related to the Production of Metal Fragments at Impingement Sites

Donaldson¹,

Smith²,

Koutalos³

et al. 2018

OJO

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Metal on metal (MOM) bearings were reintroduced as resurfacing arthroplasty (RA) for the younger, more active patient and were later incorporated into total hip arthroplasty (THA). Early results were encouraging. However, recent publications identified adverse tissue responses to metal debris, such that the majority of MOM designs have been abandoned due to the increase in cobalt-chromium (CoCr) debris and associated metal ions. Reports of MOM THA cited risks that included acetabular cups with high-inclination angles, i.e. "edge-loading", and "trunnionosis". Hip impingement was also a cited risk in one MOM study, with "type-IV" wear noted to be a sliding/impaction type of wear, characterized by deep scratches. Sliding/impaction wear mechanisms produced at impingement are not well represented in current MOM literature. Therefore, our objective in this review was to consolidate evidence for impingement risks. We hypothesize that hip impingement and subluxation with metal-backed acetabular cups can trigger wear mechanisms that result in, 1) femoral-neck notching, 2) release of large metal particles, 3) production of uniquely large scratches, defined as "microgrooves" on heads and cups, 4) formation of "polar" and "basal" microgrooves precisely aligning with cup profiles during impingement, and 5) equatorial microgrooves relate to soft-tissue sites of impingement. Relevant risk scenarios were evaluated and included hip impingement in both sitting and standing postures, head subluxation, wear patterns defining in-vivo component positions, and evidence for circulating metal fragments. The study relied on map-How to cite this paper: Donaldson, T.K.,

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Acetabular Cups in 60 mm Metal-on-Metal Bearings Subjected to Dynamic Edge-Loading with 70° Peak-Inclination in 10-Million Cycle Simulator Study

Cited by 3 publications

References 57 publications

A review of recent advances in tribology

A review of recent advances in tribology

Manufacturing of 3 Axis Hip Simulator

Adverse Wear in MOM Hip-Arthroplasty Related to the Production of Metal Fragments at Impingement Sites

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