Towards an accurate understanding of UHMWPE visco-dynamic behaviour for numerical modelling of implants

Quinci, Federico; Dressler, Matthew; Strickland, A.M.; Limbert, Georges

doi:10.1016/j.jmbbm.2013.12.023

Cited by 15 publications

(3 citation statements)

References 32 publications

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“…To improve the accuracy of the contact-pressure dependent wear model, it is necessary to include surface deformations due to creep in the model (Quinci et al, 2014). Thus, a model for dynamic compressive creep of PE from the literature (Lee et al, 2003) was adapted, assuming 50% of creep deformation would be recovered (Lee and Pienkowski, 1998) during the test interruptions to measure gravimetric wear as well as after the test.…”

Section: Creep Modelmentioning

confidence: 99%

Experimental and computational evaluation of knee implant wear and creep under in vivo and ISO boundary conditions

Dreyer,

Hosseini Nasab,

Favre

et al. 2023

Preprint

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Experimental knee implant wear testing according to ISO 14243 is a standard procedure, but it inherently possesses limitations for preclinical evaluations due to extended testing periods and costly infrastructure. In an effort to overcome these limitations, we hereby develop and experimentally validate a finite element (FE) based algorithm, including a novel cross-shear and contact pressure dependent wear and creep model, and apply it towards understanding the sensitivity of wear outcomes to the applied boundary conditions. Specifically, we investigated the application of in vivo data for level walking from the publicly available "Stan" dataset, which contains single representative tibiofemoral loads and kinematics derived from in vivo measurements of six subjects, and compared wear outcomes against those obtained using the ISO standard boundary conditions. To provide validation of the numerical models, this comparison was reproduced experimentally on a six-station knee wear simulator over 5 million cycles, testing the same implant Stan's data was obtained from. Experimental implementation of Stan's boundary conditions in displacement control resulted in approximately three times higher wear rates (4.4 vs. 1.6 mm3 per million cycles) and a more anterior wear pattern compared to the ISO standard in force control. While a force-controlled ISO FE model was unable to reproduce the bench test kinematics, and thus wear rate, displacement-controlled FE models accurately predicted the laboratory wear tests for both ISO and Stan boundary conditions. The credibility of the in silico wear and creep model was further established per the ASME V&V-40 standard. The model is thus suitable for supporting future patient specific models and development of novel implant designs.

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Section: Creep Modelmentioning

confidence: 99%

Experimental and computational evaluation of knee implant wear and creep under in vivo and ISO boundary conditions

Dreyer,

Hosseini Nasab,

Favre

et al. 2023

Preprint

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show abstract

“…Although, for computational wear analyses purposes, the UHMWPE viscoelastic/viscoplastic deformations may play a very important role in the wear phenomenon, this type of behavior has been scarcely considered in the literature (Quinci [2014]). Moreover the crack initiation from a notch in UHMWPE is a complex phenomenon that is governed by the viscoelastic fracture theory (Sirimamilla [2012]).…”

Section: Creep Testing and Modelingmentioning

confidence: 99%

Ultra High Molecular Weight Polyethylene and its Reinforcement with Carbon Nanotubes in Medical Devices

Guedes

Kanagaraj

Sreekanth

et al. 2015

Polyethylene‐Based Blends, Composites and Nanocomposites

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This chapter discusses the advantages and complexities of ultra high molecular weight polyethylene (UHMWPE) when used as a bearing material for total joint arthroplasty (TJA) and total knee arthroplasty (TKA). The UHMWPE internal structure and its mechanical response depend strongly on a diversity of factors that include radiation crosslinking, fiber reinforcement, and the addition of antioxidants such as Vitamin E or Vitamin C. All these manufacturing procedures induce morphological changes and simultaneously alter the mechanical properties of UHMWPE. The importance of UHMWPE on arthroplasty, including the advantages, the limitations and the strategies devised to overcome the known drawbacks are discussed in the first section. The following sections revise and discuss the biocompatibility, the manufacturing processes, the tribological behaviour, the aging by oxidation and irradiation of UHMWPE and UHMWPE-CNT nanocomposites. The last section analyses the viscoelastic behavior of UHMWPE and its implications on the long-term survival of total joint arthroplasty.

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“…This makes the measurement of wear difficult when considering the surface of UHMWPE, as the surface may have deformed as well as worn. Numerous studies mention the contribution of creep to the difficulty of measuring UHMWPE knee prostheses [17][18][19]. The advent of highly cross-linked polyethylene (HXLPE) and also the doping of UHMWPE with Vitamin-E for use within TKR could have an effect on this, with Takahashia et al finding that Vitamin-E doped HXLPE 'significantly' improved creep resistance when compared to conventional UHMWPE [20,21].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of wear areas on UHMWPE total knee replacement prostheses through study of their areal surface topographical parameters

Holland¹,

Fleming²,

Walton³

et al. 2018

Surf. Topogr.: Metrol. Prop.

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Total knee replacement is one of the most common elective surgeries in the world, and presents a number of challenges related to the wear of ultra-high molecular weight polyethylene (UHMWPE). This paper prese nts an analysis of the surface topographical properties of the worn and unworn condylar surfaces on a small cohort of both wear simulated and retrieved prostheses of varying designs. A number of measurement points were taken on each prostheses in a mixture of worn and unworn areas through the use of focus-variation microscopy (FVM), a non-contact method of surface measurement. Surface areal parameters were extracted from this data to analyse and search for patterns within the data. It was found that in general, worn implant surfaces appear to show smoother, less peak dominated surfaces than unworn area. It was also found that wear simulated and retrieved implants display similar characteristics of surface topography. In addition, variation was noted between different designs of TKR device, with posterior stabilised designs found to be peak dominated and cruciate retaining type implants being valley dominated.

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Towards an accurate understanding of UHMWPE visco-dynamic behaviour for numerical modelling of implants

Cited by 15 publications

References 32 publications

Experimental and computational evaluation of knee implant wear and creep under in vivo and ISO boundary conditions

Experimental and computational evaluation of knee implant wear and creep under in vivo and ISO boundary conditions

Ultra High Molecular Weight Polyethylene and its Reinforcement with Carbon Nanotubes in Medical Devices

Characterisation of wear areas on UHMWPE total knee replacement prostheses through study of their areal surface topographical parameters

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