In Vivo Tribological Performance of 231 Metal-On-Metal Hip Articulations

2002 ◽  
Vol 12 (2) ◽  
pp. 73-76 ◽  
Author(s):  
C. Rieker ◽  
P. Köttig
Keyword(s):  
Stainless Steel ◽  
Wear Rate ◽  
Tribological Performance ◽  
Wear Behaviour ◽  
Cobalt Chromium ◽  
Metal On Metal ◽  
Low Wear ◽  
One Year

231 cobalt-chromium metal-on-metal (METASUL design) retrieved articulations (297 retrieved components) were examined for their in vivo wear behaviour. A running-in period of about one year is observed where the in vivo wear rate for the whole articulation is approximately 35 μm/year. After this running-in period, the measured in vivo wear rate of the whole articulation decreases to about 5 μm/year. The metal-on-metal articulation can be considered as a very low wear articulation system. The combination of the specially designed components is mandatory to assure this low wear behaviour. In case of a mismatched bearing (stainless steel head - cobalt-chromium inlay), large amount of wear was measured.

Sliding Wear Behavior of a Duplex Stainless Steel

2009 ◽  
Vol 423 ◽  
pp. 125-130 ◽  
Author(s):  
Alvaro Mestra ◽  
Gemma Fargas ◽  
Marc Anglada ◽  
Antonio Mateo
Keyword(s):  
Stainless Steel ◽  
Wear Rate ◽  
Duplex Stainless Steel ◽  
Wear Mechanisms ◽  
Sliding Wear ◽  
Wear Behavior ◽  
Wear Behaviour ◽  
Sliding Velocity ◽  
Fatigue Wear ◽  
Sliding Distance

Duplex stainless steels contain similar amounts of austenite  and ferrite α. This two-phase microstructure leads to an excellent combination of mechanical properties and corrosion resistance. However, there are few works dealing with the wear behaviour of these steels. This paper aims to determine the sliding wear mechanisms of a duplex stainless steel type 2205. In order to do it, three different sliding velocities (0.2, 0.7 and 1.2 m/s) and six sliding distances (500, 1000, 2000, 3000, 4000 and 5000 m) were selected. The results show that wear rate depends on both sliding velocity and sliding distance. The wear mechanisms detected were plowing, microcracking and microcutting (typical mechanisms of fatigue wear). These mechanisms evolve according to sliding velocity and sliding distance, highlighting a transition zone in which wear rate is reduced.

In vitro comparison of the two hard-hard articulations for total hip replacements

2001 ◽  
Vol 215 (2) ◽  
pp. 153-160 ◽  
Author(s):  
C Rieker ◽  
R Konrad ◽  
R Schoun
Keyword(s):  
Wear Rate ◽  
Abrasive Wear ◽  
Experimental Methodology ◽  
Wear Behaviour ◽  
Linear Wear ◽  
Linear Wear Rate ◽  
Total Hip ◽  
Metal On Metal ◽  
In Vitro Comparison

Polyethylene particle disease is one of the major causes of late aseptic loosening of total hip replacement. Two hard-hard articulations (alumina-on-alumina and metal-on-metal) have been developed in Europe as an alternative to the ultra-high molecular weight polyethylene (UHMWPE) articulations. Even though these hard-hard articulations are on the market and numerous reports have been published about them, only a very limited number of studies allowing a direct in vitro comparison of the two articulations have been published so far. This paper compares in vitro these two types of articulation (alumina-on-alumina and metal-on-metal), which have been tested with a hip simulator for their tribological behaviour using exactly the same experimental methodology. This comparison shows that these two types of hard-hard articulation have very similar abrasive wear behaviour with four main features: 1. A running-in wear period (1 × 106 cycles) gives a cumulative wear of about 20 μm with head diameters of 28 mm. 2. After the running-in wear, there is a stabilization of the linear wear behaviour with a low linear wear rate/106 cycles for both types of articulation. 3. The volumetric wear rate of both articulations (<2.0 mm3/year for head diameters of 28mm) is significantly lower than that observed for metal-on-polyethylene or ceramic-on-polyethylene articulations having the same head diameter. 4. Abrasive wear is readily apparent (indicating a mixed lubrication regime) with both types of articulation. The extremely low wear performance of these articulations is confirmed and they constitute a lowwear alternative to the UHMWPE articulations currently used.

scholarly journals The influence of contact stress on the wear of cross-linked polyethylene

2018 ◽  
Vol 232 (10) ◽  
pp. 1008-1016 ◽  
Author(s):  
Göksu Kandemir ◽  
Simon Smith ◽  
Thomas J Joyce
Keyword(s):  
Contact Stress ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Wear Particle ◽  
Contact Stresses ◽  
Wear Behaviour ◽  
Cobalt Chromium ◽  
Hip Replacements ◽  
Alternative Material ◽  
Pin On Disc

Generation of wear debris and wear particle-induced osteolysis are the main limitations of metal-on-polyethylene artificial joints. Cross-linked polyethylene has been recently used, particularly in hip replacements, as an alternative material to conventional ultrahigh molecular weight polyethylene due to its superior wear resistance. This study focused on the wear behaviour of cross-linked polyethylene under different contact stresses in order to make interpretations of its long-term in-vivo performance. A 50-station SuperCTPOD (pin-on-disc) machine was used to investigate the influence of contact stress on the wear of cross-linked polyethylene pins which were articulated against cobalt chromium discs. It was found that the wear rate of cross-linked polyethylene was lower at higher contact stresses.

Alternative Bearing Surfaces: Crosslinked Polyethylenes for Total Hip Replacement. A Review

2003 ◽  
Vol 13 (3) ◽  
pp. 127-132
Author(s):  
W.H. Harris
Keyword(s):  
Lower Cost ◽  
Inert Material ◽  
Metal On Metal ◽  
Human Use ◽  
Low Wear ◽  
High Degree ◽  
Alternative Bearing ◽  
Ceramic On Ceramic

Highly crosslinked polyethylene has three major advantages as an alternative bearing surface that are in common with ceramic on ceramic and metal on metal. They are 1) prior long-term in vivo human use, 2) low wear and lysis rates and 3) being a relatively inert material. In addition they have several other advantages not shared by the hard on hard alternatives. They include lower cost, less difficulty from impingement and less difficulty with accelerated wear if the acetabular component is placed in a high degree of abduction. It does not have the brittleness of ceramic nor the metallosis that can accompany the metal on metal bearings. Polyethylene is familiar, without a learning curve. It is more adaptable, with extended lip liners, offset liners and constrained liners. For certain of the crosslinked polyethylenes wear is independent of head diameter. Thus, there appear to be several valuable advantages for considering highly crosslinked polyethylene as the preferred alternative bearing.

Wear behaviour of PMMA against 316L stainless steel under dry and lubricated conditions

2014 ◽  
Vol 66 (5) ◽  
pp. 601-608 ◽  
Author(s):  
S. Liza ◽  
A.S.M.A. Haseeb ◽  
H.H. Masjuki
Keyword(s):  
Stainless Steel ◽  
Wear Rate ◽  
Applied Load ◽  
316L Stainless Steel ◽  
Normal Load ◽  
Wear Behaviour ◽  
Distilled Water ◽  
Content Type ◽  
Ringer’S Solution ◽  
Physiological Fluid

Purpose – The purpose of this paper was to gain a better understanding of wear behaviour of polymethylmethacrylate (PMMA) in contact with 316L stainless steel under different conditions (dry condition, distilled water and Ringer's solution). PMMA is commonly used in low-stress sliding application against metal. The effects of applied load and frequency on the wear rate of PMMA against 316L stainless steel were examined. Design/Methodology/Approach – Tests were conducted under dry condition, in distilled water and in Ringer’s solution by using reciprocating wear machine. Worn surface morphology and composition was evaluated by scanning electron microscopy. Findings – PMMA wear rate increases with the increase in applied load, naturally. An increase in sliding frequency increases the wear rate under dry condition, but it decreases the wear rate in water and in Ringer’s solution. Originality value – The objective of the present work was to gain a better understanding of the wear behaviour of PMMA in contact with 316L stainless steel under different conditions (dry condition, distilled water and Ringer's solution). The effects of applied normal load and frequency on the wear rate of PMMA against 316L stainless steel at various conditions were examined experimentally. This information may have future implications for the design of materials which have a contact with physiological fluid in orthopeadic implants.

Fatigue Behavior of Stainless Steel, Titanium, and Cobalt Chromium Molybdenum Spinal Rods

2010 ◽  
Author(s):  
Anthony Paris ◽  
Alex Bergeron ◽  
Matthew Cullin ◽  
Andres Munk
Keyword(s):  
Stainless Steel ◽  
Fatigue Behavior ◽  
Permanent Deformation ◽  
Cobalt Chromium ◽  
Root Cause ◽  
Cause Of Failure ◽  
Spinal Arthrodesis ◽  
One Year ◽  
Cobalt Chromium Molybdenum

The objective of this study was to measure and compare the fatigue behavior of 316L stainless steel, titanium (Ti-6Al-4V), and cobalt chromium molybdenum (CoCrMo) spinal rods in vitro. Spinal rods are used to immobilize the spine while fusion of the vertebrae occurs (spinal arthrodesis). Implanted spinal rods are subjected to cyclic loading and are therefore susceptible to fatigue failure if fusion does not occur sufficiently quickly. A significant number of spinal rod fatigue failures have been observed between six months to one year following surgical implantation. On average, the spine will experience about 3 million cycles per year. Stress overloads can result in permanent deformation or immediate failure of the rod, however these overloads are seldom the root cause of failure—rods typically fail by fatigue [1].

Wear Behaviour of HVOF and HVAF Sprayed Wc-Cermet Coatings

1998 ◽  
Author(s):  
L. Jacobs ◽  
M. Hyland ◽  
Μ. De Bonte
Keyword(s):  
Wear Rate ◽  
Adhesive Wear ◽  
Abrasive Particle ◽  
Wear Behaviour ◽  
Tribological Behaviour ◽  
Wear Rates ◽  
Pull Out ◽  
Pin On Disc ◽  
Low Wear ◽  
Sprayed Coatings

Abstract The tribological behaviour of WC-Co-Cr coatings deposited by HVOF and HVAF and WC-Co coating deposited by HVAF was investigated in pin-on-disc tests. Wear rates were determined and wear tracks on the coatings and counterbodies were investigated in SEM. The HVAF sprayed coatings showed greater wear resistance compared to the HVOF coatings. The main wear mechanism in the WC-Co coatings was adhesive wear. The cobalt matrix is lubricious, resulting in very low wear rates and low debris generation. The main wear mechanisms in the WC-Co-Cr coatings were adhesive and abrasive wear. Adhesive wear results in pull-outs that are trapped in the contact zone and act as a third-body abrasive. Particle pull-out of the coating significantly increases the wear rate of the coated specimen. The HVAF/WC-Co-Cr coatings proved to have a better resistance to particle pull-out which reflected in a considerably lower wear rate than the HVOFIWC-Co-Cr coatings.

Understanding the differences between the wear of metal-on-metal and ceramic-on-metal total hip replacements

2008 ◽  
Vol 222 (3) ◽  
pp. 285-296 ◽  
Author(s):  
C G Figueiredo-Pina ◽  
Y Yan ◽  
A Neville ◽  
J Fisher
Keyword(s):  
Open Circuit ◽  
Long Term Results ◽  
Cobalt Chromium ◽  
Material Loss ◽  
Hip Simulator ◽  
Metal On Metal ◽  
Hip Replacements ◽  
Efficient Alternative

Hip simulator studies have been carried out extensively to understand and test artificial hip implants in vitro as an efficient alternative to obtaining long-term results in vivo. Recent studies have shown that a ceramic-on-metal material combination lowers the wear by up to 100 times in comparison with a typical metal-on-metal design. The reason for this reduction remains unclear and for this reason this study has undertaken simple tribometer tests to understand the fundamental material loss mechanisms in two material combinations: metal-on-metal and ceramic-on-ceramic. A simple-configuration reciprocating pin-on-plate wear study was performed under open-circuit potential (OCP) and with applied cathodic protection (CP) in a serum solution using two tribological couples: firstly, cobalt—chromium (Co—Cr) pins against Co—Cr plates; secondly, Co—Cr pins against alumina (Al2O3) plates. The pin and plate surfaces prior to and after testing were examined by profilometry and scanning electron microscopy. The results showed a marked reduction in wear when CP was applied, indicating that total material degradation under the OCP condition was attributed to corrosion processes. The substitution of the Co—Cr pin with an Al2O3 plate also resulted in a dramatic reduction in wear, probably due to the reduction in the corrosion—wear interactions between the tribological pair.

scholarly journals One-year performance of thin-strut cobalt chromium sirolimus-eluting stent versus thicker strut stainless steel biolimus-eluting coronary stent

2020 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Selina Vlieger ◽  
Gian B. Danzi ◽  
Floris Kauer ◽  
Rohit M. Oemrawsingh ◽  
Sinisa Stojkovic ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Coronary Stent ◽  
Cobalt Chromium ◽  
Sirolimus Eluting Stent ◽  
One Year

Osseointegration interface of calcified bone and endosseous implants

1992 ◽  
Vol 50 (2) ◽  
pp. 1096-1097
Author(s):  
K.E. Krizan ◽  
J.E. Laffoon ◽  
M.J. Buckley
Keyword(s):  
Structure And Function ◽  
Titanium Implants ◽  
En Bloc ◽  
Endosseous Implants ◽  
Ultrastructural Studies ◽  
The Past ◽  
Cacodylate Buffer ◽  
One Year ◽  
And Function

With increase use of tissue-integrated prostheses in recent years it is a goal to understand what is happening at the interface between haversion bone and bulk metal. This study uses electron microscopy (EM) techniques to establish parameters for osseointegration (structure and function between bone and nonload-carrying implants) in an animal model. In the past the interface has been evaluated extensively with light microscopy methods. Today researchers are using the EM for ultrastructural studies of the bone tissue and implant responses to an in vivo environment. Under general anesthesia nine adult mongrel dogs received three Brånemark (Nobelpharma) 3.75 × 7 mm titanium implants surgical placed in their left zygomatic arch. After a one year healing period the animals were injected with a routine bone marker (oxytetracycline), euthanized and perfused via aortic cannulation with 3% glutaraldehyde in 0.1M cacodylate buffer pH 7.2. Implants were retrieved en bloc, harvest radiographs made (Fig. 1), and routinely embedded in plastic. Tissue and implants were cut into 300 micron thick wafers, longitudinally to the implant with an Isomet saw and diamond wafering blade [Beuhler] until the center of the implant was reached.

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