scholarly journals Can Pin-on-Disk Testing Be Used to Assess the Wear Performance of Retrieved UHMWPE Components for Total Joint Arthroplasty?

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Steven M. Kurtz ◽  
Daniel W. MacDonald ◽  
Sevi Kocagöz ◽  
Mariya Tohfafarosh ◽  
Doruk Baykal
Keyword(s):  
Wear Behavior ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Volumetric Wear ◽  
Wear Properties ◽  
Wear Rates ◽  
Ultrahigh Molecular Weight ◽  
Aging Conditions ◽  
Novel Method ◽  
Pin On Disk

The objective of this study was to assess the suitability of using multidirectional pin-on-disk (POD) testing to characterize wear behavior of retrieved ultrahigh molecular weight polyethylene (UHMWPE). The POD wear behavior of 25 UHMWPE components, retrieved after 10 yearsin vivo, was compared with 25 that were shelf aged for 10–15 years in their original packaging. Components were gamma sterilized (25–40 kGy) in an air or reduced oxygen (inert) package. 9 mm diameter pins were fabricated from each component and evaluated against CoCr disks using a super-CTPOD with 100 stations under physiologically relevant, multidirectional loading conditions. Bovine serum (20 g/L protein concentration) was used as lubricant. Volumetric wear rates were found to vary based on the aging environment, as well as sterilization environment. Volumetric wear rates were the lowest for the pins in the gamma inert, shelf aged cohort. These results support the utility of using modern, multidirectional POD testing with a physiologic lubricant as a novel method for evaluating wear properties of retrieved UHMWPE components. The data also supported the hypothesis that wear rates of gamma-inert liners were lower than gamma-air liners for both retrieved and shelf aging conditions. However, this difference was not statistically significant for the retrieved condition.

The Effects of Sliding Parameters on Dry Wear Characteristics of Ti-6Al-4V Alloy

2015 ◽  
Vol 1115 ◽  
pp. 213-216 ◽  
Author(s):  
Mohammed Baba Ndaliman ◽  
Katsina Christopher Bala ◽  
Ahsan Ali Khan ◽  
Mohammad Yeakub Ali ◽  
Umma Abdullahi ◽  
...  
Keyword(s):  
Wear Rate ◽  
Wear Behavior ◽  
Weight Ratio ◽  
High Strength ◽  
Surface Wear ◽  
Wear Properties ◽  
Wear Rates ◽  
Sliding Motion ◽  
Study Results ◽  
Pin On Disk

Titanium (Ti-6Al-4V) alloy is very attractive for many applications due to its high strength-to-weight ratio and high corrosion resistance. Even then, with these attractive properties, it has poor shear strength and surface wear properties. This study is therefore undertaken to investigate the effect of sliding parameters on the surface wear behavior of Ti-6Al-4V alloy. Pin-like specimens of the alloy were produced and subjected to sliding motion on a pin-on-disk apparatus using different speeds, loads and sliding distances. The surface and specific wear rates of the alloy were evaluated as the main output of the study. Results indicate that the most severe surface wear rate of over 0.008 mm3/sec is experienced under conditions of low disk speed (50 rpm) with high input weight (46.5 N). Higher sliding distance is also found to affect the severity of the surface wear rate. All results of specific wear rates evaluated indicate that Ti-6Al-4V alloy can be classified as a low surface wear resistance material when operated under sliding counterface.

scholarly journals A COMPARATIVE STUDY ON WEAR BEHAVIOR OF HIP PROSTHESIS BY FINITE ELEMENT SIMULATION

2002 ◽  
Vol 14 (04) ◽  
pp. 139-148 ◽  
Author(s):  
JUI-PIN HUNG ◽  
JAMES SHIH-SHYN WU
Keyword(s):  
Hip Prosthesis ◽  
Polyethylene Wear ◽  
Wear Behavior ◽  
Numerical Approach ◽  
Analysis Model ◽  
Wear Rates ◽  
Femoral Heads ◽  
Artificial Hip Joints ◽  
Pin On Disk

A numerical approach was proposed to investigate the wear behavior occurred in the artificial hip joints in this paper. In the numerical simulations, the wear coefficients taken from pin-on-disk tests were introduced into the wear analysis model to assess the wear rates of polyethylene acetabular cups against metallic or ceramic femoral heads. For the established material combinations, different values of polyethylene wear rates were obtained respectively, which were not necessarily the realistic one as expected in vivo but could be confirmed after further discussion on the wear mechanism involved in wear tests. Current results indicated that the polyethylene/ceramic couples represented better wear performances than the polyethylene/metal couples. Furthermore, the ratio of wear rates for polyethylene cups against alumina and the metallic femoral heads was 0.5, which agreed well with that deduced from clinical studies or laboratory hip simulators. It is obvious that these comparable wear behaviors observed from clinics or laboratory studies also can be found by means of the numerical simulation.

Sliding Wear Behavior of Remelted Al2O3-TiO2 Plasma Sprayed Coatings on Titanium

2016 ◽  
Vol 254 ◽  
pp. 231-236 ◽  
Author(s):  
Ion Dragoş Uţu ◽  
Gabriela Marginean ◽  
Iosif Hulka ◽  
Viorel Aurel Şerban
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Pure Titanium ◽  
Titanium Substrate ◽  
Atmospheric Plasma ◽  
Wear Properties ◽  
Before And After ◽  
Sprayed Coating ◽  
Pin On Disk ◽  
Sprayed Coatings

Microstructure and wear properties of the Al2O3-13.wt% TiO2 thermally sprayed coatings before and after remelting were investigated in this study. The coatings were deposited on a pure titanium substrate using the atmospheric plasma spraying (APS) process. The as-sprayed coatings were electron beam (EB) modified in order to improve their compactness and bonding strength.The effect of EB remelting on the microstructure, phase constituents and wear properties was investigated using scanning electron microscopy (SEM), X-Ray diffraction technique and hardness measurements. The sliding wear behavior was tested using a pin on disk method.The results showed that the remelting process had a positive effect removing the lamellar defect of the as-sprayed coating and improving the compactness, hardness and wear behavior.

Ultrahigh Molecular Weight Polyethylene in Total Joint Components

1985 ◽  
Vol 55 ◽  
Author(s):  
Timothy M. Wright ◽  
Clare M. Rimnac ◽  
Donald L. Bartel
Keyword(s):  
Molecular Weight ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Knee Prostheses ◽  
Surface Degradation ◽  
Severe Problem ◽  
Total Hip ◽  
Analytical Studies ◽  
Ultrahigh Molecular Weight ◽  
Total Knee

ABSTRACTThis article reviews the problem of ultrahigh molecular weight polyethylene component surface degradation in total hip and total knee prostheses, including its clinical implications. Several factors affecting surface damage have been identified from a combination of the observations of in-vivo degradation made on retrieved components, experimental measurement of contact stresses on polyethylene components as a result of contact with their metallic counterpart, and analytical studies of both contact stress and the stresses beneath the polyethylene surface. Both the observations of in-vivo surface degradation and the analytical studies demonstrate that surface degradation is a more severe problem in total knee replacements than in total hip replacements. The performance of polyethylene components, as affected by design factors such as material thickness and material modification, is also considered.

Evaluation of Total Ankle Arthroplasty Using Highly Crosslinked Ultrahigh-Molecular-Weight Polyethylene Subjected to Physiological Loading

2019 ◽  
Vol 40 (8) ◽  
pp. 880-887 ◽  
Author(s):  
Jeffrey E. Bischoff ◽  
Mehul A. Dharia ◽  
Justin S. Hertzler ◽  
Oliver N. Schipper
Keyword(s):  
Fatigue Strength ◽  
Fatigue Testing ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Fatigue Loading ◽  
Strength Properties ◽  
Total Ankle Arthroplasty ◽  
Wear Properties ◽  
Ankle Arthroplasty ◽  
Walking Gait

Background: Highly crosslinked polyethylene (HXLPE) was developed for its superior wear properties in comparison to conventional polyethylene (CPE). Concern over fatigue resistance has prevented widespread adoption of HXLPE for use in total ankle arthroplasty (TAA). The aim of this study was to determine whether HXLPE has sufficient fatigue strength for total ankle arthroplasty under simulated physiologically relevant motion profiles and loading in the ankle. Methods: Physiologic load and motion profiles representative of walking gait were incorporated into a computational model of a semiconstrained, fixed-bearing TAA to determine the loading state with highest stresses in the HXLPE bearing. Subsequent fatigue testing to 10 million cycles (Mc) at 5600 N was performed to assess bearing strength. Results: Peak stresses in the bearing were predicted at peak axial load and peak dorsiflexion during gait, occurring near heel off. All samples withstood 10 Mc of fatigue loading at that orientation without polyethylene bearing fracture. Conclusion: HXLPE had sufficient fatigue strength to withstand 10 Mc of loading at more than 5 times body weight at the point of peak stresses during simulated gait in total ankle arthroplasty. Clinical Relevance: HXLPE may be mechanically strong enough to withstand the in vivo demands of the ankle. Improvements in wear afforded by HXLPE can be obtained without compromising sufficient polyethylene strength properties in total ankle arthroplasty.

High efficiency fabrication of ultrahigh molecular weight polyethylene submicron filaments/sheets by flash-spinning

2016 ◽  
Vol 36 (1) ◽  
pp. 97-102 ◽  
Author(s):  
Lei Xia ◽  
Peng Xi ◽  
Bo-wen Cheng
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
High Efficiency ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Potential Method ◽  
Forming Process ◽  
Commercial Products ◽  
Ultrahigh Molecular Weight ◽  
Novel Method ◽  
Spinning Speed

Abstract In this study, we propose a novel method for preparing continuous ultrahigh molecular weight polyethylene (UHMWPE) filaments by flash-spinning. The filaments were processed by calendaring to obtain the sheets. The morphology of the filaments and the sheets, the forming process, the optimal fabrication conditions, mechanical properties, spinning speed, and the rate of spinning of the filaments were investigated. The results showed that the filaments were composed of bunches of microfibers and the diameter of the filaments and the microfibers ranged from 0.15 mm to 0.22 mm and 0.2 μm to 5 μm, respectively. For a given concentration of 5 wt% of the UHMWPE, optimal specimens were obtained only when the temperature was in the range 150–210°C and the pressure was in the range 8–20 MPa. The spinning speed and the polymer consumption increased with enhancement in the pressure and the value reached as high as 47.2 m/s and 116.7 g/min, respectively. The properties and the spinning efficiency of the filaments revealed that flash-spinning is a potential method for manufacturing commercial products in various fields of application.

Improvement of UHMWPE Properties for Bioimplants by Gamma Irradiation

2011 ◽  
Vol 700 ◽  
pp. 207-210
Author(s):  
Frantisek Cerny ◽  
Mohamed Ali Khalil Ibrahim ◽  
Jan Suchanek ◽  
Svatava Konvickova ◽  
Vladimir Jech ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Gamma Irradiation ◽  
Room Temperature ◽  
Mechanical Characteristics ◽  
Wear Behavior ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Original Material ◽  
Friction Behavior ◽  
Ultrahigh Molecular Weight ◽  
Temperature Radiation

The effect of gamma irradiation and subsequent thermal treatment on the wear resistance and friction behavior of ultrahigh molecular weight polyethylene (UHMWPE) has been studied. Irradiation of the polymer was performed using a 60Co γ-emitter at laboratory temperature. Radiation dose 50 kGy was applied. Some irradiated samples were thermally treated at 150˚C for period of 30 min. and then slowly cooled to room temperature. A linear reciprocating tribometer was used to investigate the wear behavior of UHMWPE against Co-Cr-Mo alloy. The tests have been performed in unlubrication conditions. An important increase in wear resistance of the modified UHMWPE in comparison with the original material was proved. Besides wear rate the selected mechanical characteristics (friction coefficient, Young’s modulus, yield strength, fracture strength, and hardness) of original and modified samples of UHMWPE have been determined.

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