Multi-Scale Evaluation of Wear in UHMWPE-Metal Hip Implants Tested in a hip Joint Simulator

Trommer, Rafael Mello; Maru, Márcia Marie; Filho, Waldyr Lopes de Oliveira; Nykanen, V.P.S.; Gouvêa, C.P.; Archanjo, Bráulio S.; Ferreira, Erlon H. Martins; Silva, Rui; Achete, Carlos A.

doi:10.1016/j.biotri.2015.08.001

Cited by 34 publications

(20 citation statements)

References 55 publications

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“…2A) and of stainless steel (three specimen pairs, results in Fig. 2B) up to five million cycles 31 . From the slope of the graphical representation, and assuming a linear curve using the least square method, it is possible to estimate the wear rate of each individual sample 37 .…”

Section: Hip Wear Simulation Methodologymentioning

confidence: 99%

“…Using advanced techniques for atomic level analyses of the UHMWPE can reveal aspects of material structure modifications related to wear performance. The wear performance can become worst if the UHMWPE material undergoes strain softening while running under multi-directional mechanical stress field 30, 31…”

Section: Why Simulate Wear In a Hip Implant?mentioning

confidence: 99%

“…However, inaccurate measurement of mass loss of the test specimens affects the confidence of the information disseminated about the wear quality of the prostheses being tested. To overcome this possible drawback, geometrical approaches using three-dimensional Coordinate-Measuring Machine (CMM) have been coupled to hip wear simulation tests to obtain more accurate measurement of wear 31, 44. Geometrical approaches have been considered as an additional analysis to hip wear simulation because it has the advantage of identification of the location of wear and its corresponding depth precisely.…”

Section: Future Of Hip Simulation Wear Testsmentioning

confidence: 99%

“…The wear performance can become worst if the UHMWPE material undergoes strain softening while running under multi-directional mechanical stress field. 30 , 31 …”

Section: Why Simulate Wear In a Hip Implant?mentioning

confidence: 99%

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Importance of preclinical evaluation of wear in hip implant designs using simulator machines

Trommer

Maru

2017

Revista Brasileira de Ortopedia (English Edition)

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Total hip arthroplasty (THA) is a surgical procedure that involves the replacement of the damaged joint of the hip by an artificial device. Despite the recognized clinical success of hip implants, wear of the articulating surfaces remains as one of the critical issues influencing performance. Common material combinations used in hip designs comprise metal-on-polymer (MoP), ceramic-on-polymer (CoP), metal-on-metal (MoM), and ceramic-on-ceramic (CoC). However, when the design of the hip implant is concerned besides the materials used, several parameters can influence its wear performance. In this scenario, where the safety and efficacy for the patient are the main issues, it is fundamental to evaluate and predict the wear rate of the hip implant design before its use in THA. This is one of the issues that should be taken into account in the preclinical evaluation step of the product, in which simulated laboratory tests are necessary. However, it is fundamental that the applied motions and loads can reproduce the wear mechanisms physiologically observed in the patient. To replicate the in vivo angular displacements and loadings, special machines known as joint simulators are employed. This article focuses on the main characteristics related to the wear simulation of hip implants using mechanical simulators, giving information to surgeons, researchers, regulatory bodies, etc., about the importance of preclinical wear evaluation. A critical analysis is performed on the differences in the principles of operation of simulators and their effects on the final results, and about future trends in wear simulation.

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Section: Hip Wear Simulation Methodologymentioning

confidence: 99%

Section: Why Simulate Wear In a Hip Implant?mentioning

confidence: 99%

Section: Future Of Hip Simulation Wear Testsmentioning

confidence: 99%

“…The wear performance can become worst if the UHMWPE material undergoes strain softening while running under multi-directional mechanical stress field. 30 , 31 …”

Section: Why Simulate Wear In a Hip Implant?mentioning

confidence: 99%

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Importance of preclinical evaluation of wear in hip implant designs using simulator machines

Trommer

Maru

2017

Revista Brasileira de Ortopedia (English Edition)

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“…There is a scarcity of available information regarding the variation of sliding distance or CS ratio among THA patients and their association with patient‐specific in vivo kinematics and component orientation. Existing computational models in the current literature rely heavily on kinematic inputs either from standard laboratory testing protocols or from single subject data in the literature …”

mentioning

confidence: 99%

In vivo sliding distance on the metal‐on‐polyethylene total hip arthroplasty articulation using patient‐specific gait analysis

Peng

Arauz

et al. 2018

Journal Orthopaedic Research

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Metal-on-polyethylene (MoP) is the most commonly used bearing surface in primary total hip arthroplasty (THA). Polyethylene wear debris remains a major concern. Studies investigating the wear performance based on patient-specific in vivo kinematics and component orientation remains largely lacking. The primary goal of this study was to identify patterns of the distribution of sliding distance and cross-shear ratio among THA patients. A validated approach combining dual fluoroscopic imaging system and computed-tomography was utilized to quantify in vivo gait kinematics and component orientations in 48 total hips. The distribution of accumulated sliding distance and cross-shear ratio over the polyethylene bearing surface was calculated and analyzed using principal component analysis (PCA). Strong patient-specific variation in sliding distance and cross-shear ratio was observed. PCA detected two principal components (PCs) of the sliding distance that together contribute to 94.8% of the total variation. PCA detected four PCs that together contribute to 86% of the total variation of the cross-shear ratio. Regression analysis identified a positive association between cross-shear magnitude and axial and frontal range of motion (RoM). Increased cup inclination, stem anteversion, and reduced cup anteversion may lead to superiorly distributed high cross-shear region, potentially accelerating wear. Our study investigated, in vivo sliding distance and cross-shear pattern using a comprehensive patient-specific dataset and detected several wear indicators under in vivo conditions. These findings provided useful reference values that may help to assess wear in MoP THA patients. © 2018 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res.

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Enhancement of mechanical properties of ultra‐high molecular weight polyethylene nanocomposites without losing thermal stability

Soares

Almeida

Moraes

et al. 2022

J of Applied Polymer Sci

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This study involves the development of individual and hybrid nanocomposites and their structural, thermal, and mechanical characterization, using wear‐resistant fillers like aluminum oxide (Al2O3) and boron carbide (B4C) in a high‐performance polymer, namely, ultra‐high molecular weight polyethylene (UHMWPE). Nanocomposites were produced by ball milling followed by hot‐pressing molding, using vitamin E as an antioxidant agent. Fourier transform infrared spectroscopy and x‐ray diffractometry revealed no interaction at the molecular level between the phases. Optical microscopy evidenced a network formed by the nanoparticles surrounding the polymeric grains in the nanocomposites structure. Field emission scanning electron microscopy and confocal Raman spectroscopy helped understand this morphology. The mixing process results in a polymeric powder covered by the nanometric particles with a superficial interaction. Thermogravimetric analysis and differential scanning calorimetry were able to show the stability of the polymeric matrix, even with the presence of the nanofillers, which is possible due to the nanocomposites' structure. The produced nanocomposites present enhancement of their mechanical properties as compared to the pure polymer, evidenced by indentation tests. This work shows that UHMWPE can be manipulated to suit industrial applications that demand good mechanical reinforcement without losing thermal stability.

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Multi-Scale Evaluation of Wear in UHMWPE-Metal Hip Implants Tested in a hip Joint Simulator

Cited by 34 publications

References 55 publications

Importance of preclinical evaluation of wear in hip implant designs using simulator machines

Importance of preclinical evaluation of wear in hip implant designs using simulator machines

In vivo sliding distance on the metal‐on‐polyethylene total hip arthroplasty articulation using patient‐specific gait analysis

Enhancement of mechanical properties of ultra‐high molecular weight polyethylene nanocomposites without losing thermal stability

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