On the true wear rate of ultrahigh molecular weight polyethylene in the total knee prosthesis

1984 ◽  
Vol 18 (2) ◽  
pp. 207-224 ◽  
Author(s):  
Robert M. Rose ◽  
Michael D. Ries ◽  
Igor L. Paul ◽  
Aldo M. Crugnola ◽  
Edward Ellis
Keyword(s):  
Molecular Weight ◽  
Wear Rate ◽  
Knee Prosthesis ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Total Knee Prosthesis ◽  
Ultrahigh Molecular Weight ◽  
Total Knee

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.

Tribological behavior of an ultrahigh molecular weight polyethylene in lubricated environments

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
O. K. Kahyaoglu ◽  
H Unal ◽  
A Mimaroglu ◽  
S.H. Yetgin
Keyword(s):  
Molecular Weight ◽  
Wear Rate ◽  
Coefficient Of Friction ◽  
Salt Solution ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Specific Wear Rate ◽  
Distilled Water ◽  
Aisi 304L ◽  
Ultrahigh Molecular Weight ◽  
The Coefficient Of Friction

AbstractThe wear and friction performance of GUR 1020 grade ultrahigh molecular weight polyethylene (UHMWPE) polymer was studied in distilled water, HASS (Hank’s balanced salt solution) and several protein lubrication environments. Wear tests were carried out using polymer pin -on AISI 304L stainless steel disc apparatus. Tests conditions were room temperature, 40N, 80N and 120N applied loads and 0.5 m/s sliding speed. For the range of load and speed value of this work, the coefficient of friction and wear rate for UHMWPE polymer decreases with the increase in applied load values. The coefficient of friction is highest and the specific wear rate values is lowest under HASS +HA solution lubricant. The average specific wear rate values for UHMWPE polymer under distilled water and HASS+HA (Hank’s balanced salt solution with Hyaluronic acid) lubrication conditions are in the order of 9x10-15 m2/N and 3x10-15 m2/N respectively. The wear mechanism includes abrasion and adhesive processes.

Does Vitamin E–Stabilized Ultrahigh-Molecular-Weight Polyethylene Address Concerns of Cross-Linked Polyethylene in Total Knee Arthroplasty?

2012 ◽  
Vol 27 (3) ◽  
pp. 461-469 ◽  
Author(s):  
Hani Haider ◽  
Joel N. Weisenburger ◽  
Steven M. Kurtz ◽  
Clare M. Rimnac ◽  
Jordan Freedman ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Total Knee Arthroplasty ◽  
Vitamin E ◽  
Knee Arthroplasty ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Ultrahigh Molecular Weight ◽  
Total Knee

Fluid Composition Impacts Standardized Testing Protocols in Ultrahigh Molecular Weight Polyethylene Knee Wear Testing

2005 ◽  
Vol 219 (6) ◽  
pp. 457-464 ◽  
Author(s):  
T Schwenke ◽  
C Kaddick ◽  
E Schneider ◽  
M A Wimmer
Keyword(s):  
Molecular Weight ◽  
Weight Gain ◽  
Calf Serum ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Wear Testing ◽  
Fluid Composition ◽  
Wear Rates ◽  
Ultrahigh Molecular Weight ◽  
Total Knee ◽  
Joint Prostheses

Wear of total knee replacements is determined gravimetrically in simulator studies. A mix of bovine serum, distilled water, and additives is intended to replicate the lubrication conditions in vivo. Weight gain due to fluid absorption during testing is corrected using a load soak station. In this study, three sets of ultrahigh molecular weight polyethylene tibial plateau were tested against highly polished titanium condyles. Test 1 was performed in two different institutions on the same simulator according to the standard ISO 14243-1, using two testing lubricants. Test 2 and test 3 repeated both previous test sections. The wear and load soak rates changed significantly with the lubricant. The wear rate decreased from 16.9 to 7.9 mg weight loss per million cycles when switching from fluid A to fluid B. The weight gain of the load soak specimen submersed in fluid A was 6.1 mg after 5 × 106 cycles, compared with 31.6 mg for the implant in fluid B after the same time period. Both lubricants were mixed in accordance with ISO 14243 ( Implants for surgery - wear of total knee-joint prostheses), suggesting that calf serum should be diluted to 25 ± 2 per cent with deionized water and a protein mass concentration of not less than 17 g/1. The main differences were the type and amount of additives that chemically stabilize the lubricant throughout the test. The results suggest that wear rates can only be compared if exactly the same testing conditions are applied. An agreement on detailed lubricant specifications is desirable.

A striated pattern of wear in ultrahigh-molecular-weight polyethylene components of Miller-Galante total knee arthroplasty

1998 ◽  
Vol 13 (1) ◽  
pp. 8-16 ◽  
Author(s):  
Markus A. Wimmer ◽  
Thomas P. Andriacchi ◽  
Raghu N. Natarajan ◽  
Joachim Loos ◽  
Matthias Karlhuber ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Ultrahigh Molecular Weight ◽  
Total Knee

Novel Route to Fatigue-Resistant Fully Sintered Ultrahigh Molecular Weight Polyethylene for Knee Prosthesis

2005 ◽  
Vol 6 (2) ◽  
pp. 942-947 ◽  
Author(s):  
S. Rastogi ◽  
L. Kurelec ◽  
D. Lippits ◽  
J. Cuijpers ◽  
M. Wimmer ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Knee Prosthesis ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Ultrahigh Molecular Weight

scholarly journals Increase in the Tibial Slope Reduces Wear after Medial Unicompartmental Fixed-Bearing Arthroplasty of the Knee

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Patrick Weber ◽  
Christian Schröder ◽  
Jens Schwiesau ◽  
Sandra Utzschneider ◽  
Arnd Steinbrück ◽  
...  
Keyword(s):  
Wear Rate ◽  
Knee Prosthesis ◽  
Tibial Slope ◽  
Fixed Bearing ◽  
Total Knee Prosthesis ◽  
Unicompartmental Arthroplasty ◽  
Posterior Tibial ◽  
Unicompartmental Knee ◽  
Total Knee

Introduction. Unicompartmental arthroplasty of the knee in patients with isolated medial osteoarthritis gives good results, but survival is inferior to that of total knee prosthesis. Knees may fail because positioning of the prosthesis has been suboptimal. The aim of this study was to investigate the influence of the tibial slope on the rate of wear of a medial fixed-bearing unicompartmental knee arthroplasty.Materials and Methods. We simulated wear on a medial fixed-bearing unicompartmental knee prosthesis (Univation) in vitro with a customised, four-station, and servohydraulic knee wear simulator, which exactly reproduced the walking cycle (International Organisation for Standardisation (ISO) 14243-1:2002(E)). The medial prostheses were inserted with 3 different posterior tibial slopes: 0°, 4°, and 8° (n= 3 in each group).Results. The wear rate decreased significantly between 0° and 4° slope from 10.4 (SD 0.62) mg/million cycles to 3.22 (SD 1.71) mg/million cycles. Increasing the tibial slope to 8° did not significantly change the wear rate.Discussion. As an increase in the tibial slope reduced the wear rate in a fixed-bearing prosthesis, a higher tibial slope should be recommended. However, other factors that are influenced by the tibial slope (e.g., the tension of the ligament) must also be considered.

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