Field Variable Associations With Scratch Orientation Dependence of UHMWPE Wear: A Finite Element Analysis

Paul, Matthew C.; Glennon, Liam P.; Baer, Thomas; Brown, Thomas

doi:10.1115/1.2939273

Cited by 5 publications

(6 citation statements)

References 24 publications

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“…Studies have shown that scratches oriented in specific directions result in different wear volumes, depending on the angle of scratch-traverse (Dowson et al, 1987;Glennon et al, 2005); therefore scratch directionality may have a significant impact on the amount of wear acceleration from roughened femoral heads. Wear from embedded debris resulting in scratches in specific directions could potentially be represented with this model if the wear coefficient in the original sliding-distance-coupled finite element wear model was modified, for example, by using a wear coefficient that varied depending on the instantaneous direction of sliding along scratches, as reflected in continuum surrogates such as that of Paul et al (2005). The present embedment model does not take into account the changing deleterious effects of particles loose between the articulating surfaces.…”

Section: Article In Pressmentioning

confidence: 98%

Problematic sites of third body embedment in polyethylene for total hip wear acceleration

Stewart¹,

Pedersen²,

Callaghan³

et al. 2006

Journal of Biomechanics

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Section: Article In Pressmentioning

confidence: 98%

Problematic sites of third body embedment in polyethylene for total hip wear acceleration

Stewart¹,

Pedersen²,

Callaghan³

et al. 2006

Journal of Biomechanics

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“…These data suggest counterface damage regions with preferential scratch directionality can liberate large amounts of PE debris, apparently by a slicing/shearing mechanism, at critical (acute) attack angles. A complementary local three-dimensional finite element model was developed of orientation-specific PE articulation with a scratched metal counterface [36] to explore continuum level stress/strain parameters potentially correlating with the orientation dependence of scratch wear in the above scratch-directionality physical experiment. Computed maximum stress values exceeded the yield strength of UHMWPE for all scratch orientations but did not vary appreciably among scratch orientations.…”

Section: Quantitative Studies Of Third-body Wear Accelerationmentioning

confidence: 99%

2009 Nicolas Andry Award: Clinical Biomechanics of Third Body Acceleration of Total Hip Wear

Brown

Pedersen

Callaghan

2009

Clinical Orthopaedics &Amp; Related Research

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Aseptic loosening attributable to wear-related osteolysis historically has been the predominant cause of failure in THA. Advances in low-wear bearing couples show great promise to substantially reduce this long-standing problem. However, there always has been striking variability in wear rate in any given cohort of patients who are similarly implanted, with some individuals typically experiencing near order-of-magnitude elevations above group mean. Third-body wear is likely a major contributor to many of these most osteolysis-prone outliers. For the patients affected, third-body effects may obviate many of the gains otherwise achieved by contemporary bearing surface improvements. Toward heightening visibility in terms of consequences for patients, this review paper summarizes an interrelated series of investigations quantifying construct level manifestations of third-body wear. Long-term followup of a unique group of patients with elevated third-body challenge shows statistically significant and clinically important wear-rate increases. A series of finite element models, validated physically, shows the linkage of location of third-body damage with variability of volumetric wear-rate acceleration and shows the effects of various implant factors, surgeon factors, and patient factors in the presence of third-body challenge. Finally, a mechanism for third-body debris access to wear-critical locations on the bearing surface is identified analytically and corroborated in laboratory experiments and implant retrievals.

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“…FE models have previously been used to study the micromechanics of individual asperities (McNie et al 1998, Paul et al 2008) as they relate to local polyethylene damage. Such models have analyzed the stress elevations and elastic/plastic strains caused by individual scratches articulating against polyethylene.…”

Section: Introductionmentioning

confidence: 99%

A novel formulation for scratch-based wear modelling in total hip arthroplasty

Kruger

Tikekar

Heiner

et al. 2013

Computer Methods in Biomechanics and Biomedical Engineering

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Damage to the femoral head in total hip arthroplasty often takes the form of discrete scratches, which can lead to dramatic wear acceleration of the polyethylene (PE) liner. Here, a novel formulation is reported for finite element analysis of wear acceleration due to scratch damage. A diffused-light photography technique was used to globally locate areas of damage, providing guidance for usage of high-magnification optical profilometry to determine individual scratch morphology. This multiscale image combination allowed comprehensive input of scratch-based damage patterns to a finite element (FE) Archard wear model, to determine the wear acceleration associated with specific retrieval femoral heads. The wear algorithm imposed correspondingly elevated wear factors on areas of PE incrementally overpassed by individual scratches. Physical validation was provided by agreement with experimental data for custom-ruled scratch patterns. Illustrative wear acceleration results are presented for four retrieval femoral heads.

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Field Variable Associations With Scratch Orientation Dependence of UHMWPE Wear: A Finite Element Analysis

Cited by 5 publications

References 24 publications

Problematic sites of third body embedment in polyethylene for total hip wear acceleration

Problematic sites of third body embedment in polyethylene for total hip wear acceleration

2009 Nicolas Andry Award: Clinical Biomechanics of Third Body Acceleration of Total Hip Wear

A novel formulation for scratch-based wear modelling in total hip arthroplasty

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