polyethylene & tribology - clubortho.fr · polyethylene & tribology jecot rabat, september...
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Polyethylene & TribologyJECOT Rabat, September 2010
A. Rodriguez MD; PhD
vendredi 14 janvier 2011
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Polyethylene & TribologyJECOT Rabat, September 2010
A. Rodriguez MD; PhD
Servei de Cirurgia Ortopèdica i Traumatologia Hospital Universitari Sant Joan Reus (Spain, EU)
Orthopedic Surgery Department CHR de la Citadelle Liège (Belgium, EU)
vendredi 14 janvier 2011
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HISTORY OF POLYETHYLENES
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HISTORY OF POLYETHYLENE
• 1898 Accidentally discovery by a German chemist Hans von Pechmann
• 1939 Beginning of the production of low density polyethylene
• 1951 Development of the Phillips catalyst• 1953 Development of the Ziegler catalyst• 1962 First implantation by J. Charnley
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ULTRA HIGH MOLECULAR WEIGHT
• Molecular weight usually between 2 and 6 million
• Typical application:– Joint replacement– Skis and snowboards– Ice hockey and field hockey sticks
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PRODUCTION
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CROSS-‐LINKING OF UHMWPE
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DEVELOPMENT OF HIGHLY CROSS-‐
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
vendredi 14 janvier 2011
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CROSS-‐LINKING OF UHMWPE
vendredi 14 janvier 2011
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CROSS-‐LINKING OF UHMWPE
H
H
H
H
H
HH
H
H
H
H
H H
H H
H H
HH
H
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CROSS-‐LINKING OF UHMWPE
H
H
H
H
H
HH
H
H
H
H
H H
H H
H H
HH
H
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CROSS-‐LINKING OF UHMWPE
Reaction between a terminal vinyl doublebond and a radical on an adjacent chain
H
H
H
H
H
HH
H
H
H
H
H H
H H
H H
HH
H
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CROSS-‐LINKING OF UHMWPE
Y-crosslink
H
HH
HH
HH
HH
H
H
H
H
H H
H
H
H
Exothermic reactionΔH = -88 kJ/mol
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DEVELOPMENT OF HIGHLY CROSS-‐
Zimmer Zimmer DePuy S&NStryker
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Molded Sheet
GUR 1050Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
95 kGy E-BeamWarm
Remelting[150ºC]
EtOSterilisation
100 kGy E-Beam
Remelting[> 135ºC]
Gas PlasmaSterilisation
50 kGy GammaIrradiation
Remelting[155ºC]
Gas PlasmaSterilisation
100 kGy GammaIrradiation
Remelting[150ºC]
EtOSterilisation
Crossfire™ Durasul™ Longevity™ Marathon™ XLPE™
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
Zimmer Zimmer DePuy S&NStryker
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Molded Sheet
GUR 1050Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
95 kGy E-BeamWarm
Remelting[150ºC]
EtOSterilisation
100 kGy E-Beam
Remelting[> 135ºC]
Gas PlasmaSterilisation
50 kGy GammaIrradiation
Remelting[155ºC]
Gas PlasmaSterilisation
100 kGy GammaIrradiation
Remelting[150ºC]
EtOSterilisation
Crossfire™ Durasul™ Longevity™ Marathon™ XLPE™
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
Zimmer Zimmer DePuy S&NStryker
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Molded Sheet
GUR 1050Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
95 kGy E-BeamWarm
Remelting[150ºC]
EtOSterilisation
100 kGy E-Beam
Remelting[> 135ºC]
Gas PlasmaSterilisation
50 kGy GammaIrradiation
Remelting[155ºC]
Gas PlasmaSterilisation
100 kGy GammaIrradiation
Remelting[150ºC]
EtOSterilisation
Crossfire™ Durasul™ Longevity™ Marathon™ XLPE™
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
Zimmer Zimmer DePuy S&NStryker
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Molded Sheet
GUR 1050Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
95 kGy E-BeamWarm
Remelting[150ºC]
EtOSterilisation
100 kGy E-Beam
Remelting[> 135ºC]
Gas PlasmaSterilisation
50 kGy GammaIrradiation
Remelting[155ºC]
Gas PlasmaSterilisation
100 kGy GammaIrradiation
Remelting[150ºC]
EtOSterilisation
Crossfire™ Durasul™ Longevity™ Marathon™ XLPE™
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
Zimmer Zimmer DePuy S&NStryker
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Molded Sheet
GUR 1050Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
95 kGy E-BeamWarm
Remelting[150ºC]
EtOSterilisation
100 kGy E-Beam
Remelting[> 135ºC]
Gas PlasmaSterilisation
50 kGy GammaIrradiation
Remelting[155ºC]
Gas PlasmaSterilisation
100 kGy GammaIrradiation
Remelting[150ºC]
EtOSterilisation
Crossfire™ Durasul™ Longevity™ Marathon™ XLPE™
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
Zimmer Zimmer DePuy S&NStryker
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Molded Sheet
GUR 1050Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
95 kGy E-BeamWarm
Remelting[150ºC]
EtOSterilisation
100 kGy E-Beam
Remelting[> 135ºC]
Gas PlasmaSterilisation
50 kGy GammaIrradiation
Remelting[155ºC]
Gas PlasmaSterilisation
100 kGy GammaIrradiation
Remelting[150ºC]
EtOSterilisation
Crossfire™ Durasul™ Longevity™ Marathon™ XLPE™
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
Zimmer Zimmer DePuy S&NStryker
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Molded Sheet
GUR 1050Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
95 kGy E-BeamWarm
Remelting[150ºC]
EtOSterilisation
100 kGy E-Beam
Remelting[> 135ºC]
Gas PlasmaSterilisation
50 kGy GammaIrradiation
Remelting[155ºC]
Gas PlasmaSterilisation
100 kGy GammaIrradiation
Remelting[150ºC]
EtOSterilisation
Crossfire™ Durasul™ Longevity™ Marathon™ XLPE™
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
Zimmer Zimmer DePuy S&NStryker
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Molded Sheet
GUR 1050Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
95 kGy E-BeamWarm
Remelting[150ºC]
EtOSterilisation
100 kGy E-Beam
Remelting[> 135ºC]
Gas PlasmaSterilisation
50 kGy GammaIrradiation
Remelting[155ºC]
Gas PlasmaSterilisation
100 kGy GammaIrradiation
Remelting[150ºC]
EtOSterilisation
Crossfire™ Durasul™ Longevity™ Marathon™ XLPE™
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
Zimmer Zimmer DePuy S&NStryker
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Molded Sheet
GUR 1050Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
95 kGy E-BeamWarm
Remelting[150ºC]
EtOSterilisation
100 kGy E-Beam
Remelting[> 135ºC]
Gas PlasmaSterilisation
50 kGy GammaIrradiation
Remelting[155ºC]
Gas PlasmaSterilisation
100 kGy GammaIrradiation
Remelting[150ºC]
EtOSterilisation
Crossfire™ Durasul™ Longevity™ Marathon™ XLPE™
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
Zimmer Zimmer DePuy S&NStryker
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Molded Sheet
GUR 1050Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
95 kGy E-BeamWarm
Remelting[150ºC]
EtOSterilisation
100 kGy E-Beam
Remelting[> 135ºC]
Gas PlasmaSterilisation
50 kGy GammaIrradiation
Remelting[155ºC]
Gas PlasmaSterilisation
100 kGy GammaIrradiation
Remelting[150ºC]
EtOSterilisation
Crossfire™ Durasul™ Longevity™ Marathon™ XLPE™
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
Zimmer Zimmer DePuy S&NStryker
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Molded Sheet
GUR 1050Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
95 kGy E-BeamWarm
Remelting[150ºC]
EtOSterilisation
100 kGy E-Beam
Remelting[> 135ºC]
Gas PlasmaSterilisation
50 kGy GammaIrradiation
Remelting[155ºC]
Gas PlasmaSterilisation
100 kGy GammaIrradiation
Remelting[150ºC]
EtOSterilisation
Crossfire™ Durasul™ Longevity™ Marathon™ XLPE™
X3™
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
StrykerStryker
GUR 1050Extruded Rod
GUR 1020Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
30 kGy Gamma Irradiation
Annealing below Melt
Crossfire™ X3™
30 kGy Gamma Irradiation
30 kGy Gamma Irradiation
Annealing below Melt
Annealing below Melt
Gas PlasmaSterilisation
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
StrykerStryker
GUR 1050Extruded Rod
GUR 1020Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
30 kGy Gamma Irradiation
Annealing below Melt
Crossfire™ X3™
30 kGy Gamma Irradiation
30 kGy Gamma Irradiation
Annealing below Melt
Annealing below Melt
Gas PlasmaSterilisation
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
StrykerStryker
GUR 1050Extruded Rod
GUR 1020Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
30 kGy Gamma Irradiation
Annealing below Melt
Crossfire™ X3™
30 kGy Gamma Irradiation
30 kGy Gamma Irradiation
Annealing below Melt
Annealing below Melt
Gas PlasmaSterilisation
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
StrykerStryker
GUR 1050Extruded Rod
GUR 1020Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
30 kGy Gamma Irradiation
Annealing below Melt
Crossfire™ X3™
30 kGy Gamma Irradiation
30 kGy Gamma Irradiation
Annealing below Melt
Annealing below Melt
Gas PlasmaSterilisation
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
StrykerStryker
GUR 1050Extruded Rod
GUR 1020Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
30 kGy Gamma Irradiation
Annealing below Melt
Crossfire™ X3™
30 kGy Gamma Irradiation
30 kGy Gamma Irradiation
Annealing below Melt
Annealing below Melt
Gas PlasmaSterilisation
vendredi 14 janvier 2011
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DEVELOPMENT OF HIGHLY CROSS-‐
StrykerStryker
GUR 1050Extruded Rod
GUR 1020Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
30 kGy Gamma Irradiation
Annealing below Melt
Crossfire™ X3™
30 kGy Gamma Irradiation
30 kGy Gamma Irradiation
Annealing below Melt
Annealing below Melt
Gas PlasmaSterilisation
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DEVELOPMENT OF HIGHLY CROSS-‐
Zimmer Zimmer DePuy S&NStryker
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Molded Sheet
GUR 1050Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
95 kGy E-BeamWarm
Remelting[150ºC]
EtOSterilisation
100 kGy E-Beam
Remelting[> 135ºC]
Gas PlasmaSterilisation
50 kGy GammaIrradiation
Remelting[155ºC]
Gas PlasmaSterilisation
100 kGy GammaIrradiation
Remelting[150ºC]
EtOSterilisation
Crossfire™ Durasul™ Longevity™ Marathon™ XLPE™
Biomet
GUR 1050Extruded Rod
50 kGy GammaIrradiation
Annealing[130ºC]
Gas PlasmaSterilisation
ArCom XL™
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DEVELOPMENT OF HIGHLY CROSS-‐
Zimmer Zimmer DePuy S&NStryker
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Molded Sheet
GUR 1050Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
95 kGy E-BeamWarm
Remelting[150ºC]
EtOSterilisation
100 kGy E-Beam
Remelting[> 135ºC]
Gas PlasmaSterilisation
50 kGy GammaIrradiation
Remelting[155ºC]
Gas PlasmaSterilisation
100 kGy GammaIrradiation
Remelting[150ºC]
EtOSterilisation
Crossfire™ Durasul™ Longevity™ Marathon™ XLPE™
Biomet
GUR 1050Extruded Rod
50 kGy GammaIrradiation
Annealing[130ºC]
Gas PlasmaSterilisation
ArCom XL™
X3™
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DEVELOPMENT OF HIGHLY CROSS-‐
Zimmer Zimmer DePuy S&NStryker
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Molded Sheet
GUR 1050Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
95 kGy E-BeamWarm
Remelting[150ºC]
EtOSterilisation
100 kGy E-Beam
Remelting[> 135ºC]
Gas PlasmaSterilisation
50 kGy GammaIrradiation
Remelting[155ºC]
Gas PlasmaSterilisation
100 kGy GammaIrradiation
Remelting[150ºC]
EtOSterilisation
Crossfire™ Durasul™ Longevity™ Marathon™ XLPE™
Biomet
GUR 1050Extruded Rod
50 kGy GammaIrradiation
Annealing[130ºC]
Gas PlasmaSterilisation
ArCom XL™
X3™ AltrX™
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DEVELOPMENT OF HIGHLY CROSS-‐
Zimmer Zimmer DePuy S&NStryker
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Extruded Rod
GUR 1050Molded Sheet
GUR 1050Molded Sheet
75 kGy GammaIrradiation
Annealing[130ºC]
30 kGy GammaSterilisation
95 kGy E-BeamWarm
Remelting[150ºC]
EtOSterilisation
100 kGy E-Beam
Remelting[> 135ºC]
Gas PlasmaSterilisation
50 kGy GammaIrradiation
Remelting[155ºC]
Gas PlasmaSterilisation
100 kGy GammaIrradiation
Remelting[150ºC]
EtOSterilisation
Crossfire™ Durasul™ Longevity™ Marathon™ XLPE™
Biomet
GUR 1050Extruded Rod
50 kGy GammaIrradiation
Annealing[130ºC]
Gas PlasmaSterilisation
ArCom XL™
X3™ AltrX™E-
Poly™
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LONGEVITY
GUR 1050Molded Sheet
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LONGEVITY
GUR 1050Molded Sheet
100 kGy E-BeamCold Irradiation
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LONGEVITY
GUR 1050Molded Sheet
100 kGy E-BeamCold Irradiation
Remelting[> 135ºC]
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LONGEVITY
GUR 1050Molded Sheet
100 kGy E-BeamCold Irradiation
Remelting[> 135ºC]
Gas PlasmaSterilisation
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MECHANICS OF WEAR
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RELATIVE MOTION BETWEEN HEAD
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RELATIVE MOTION BETWEEN HEAD
Path of a Pointon the Femoral Head
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RELATIVE MOTION BETWEEN HEAD
Path of a Pointon the Femoral Head
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RELATIVE MOTION BETWEEN HEAD
Path of a Pointon the Femoral Head
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RELATIVE MOTION BETWEEN HEAD
Path of a Pointon the Femoral Head
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RELATIVE MOTION BETWEEN HEAD
Path of a Pointon the Femoral Head
Crossing Pathsof Motion
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UHMWPE MOLECULAR STRUCTURE AND
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UHMWPE MOLECULAR STRUCTURE AND
Load and Motion
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UHMWPE MOLECULAR STRUCTURE AND
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UHMWPE MOLECULAR STRUCTURE AND
Stronger
Wea
ker
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UHMWPE MOLECULAR STRUCTURE AND
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UHMWPE MOLECULAR STRUCTURE AND
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UHMWPE MOLECULAR STRUCTURE AND
Load and Motion
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UHMWPE MOLECULAR STRUCTURE AND
Strong
Stro
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WEAR IN-‐VITRO
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IN-‐VITRO WEAR ANALYSISH. McKellop et al, JOR, 17, 1999, p. 851
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IN-‐VITRO WEAR ANALYSISO.K. Muratoglu et al, World Tribology Forum in Arthroplasty, Hans Huber, 2001, p. 245
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M.P. Laurent et al, SBM, 6th World Congress, 2000, Kamuela, p. 851
HIP SIMULATOR TESTING
0
500
1000
1500
2000
0 8 15 23 30
Volu
met
ric W
ear [
mm
3]
Cycles [millions]
Conv. 32 mmConv. 22 mmLongevity 32 mmLongevity 22 mm
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IN-‐VITRO WEAR ANALYSIS
• Mean wear rate of convenRonal polyethylene: – 11.6 ± 0.1 mg/106cycles
• Mean wear rate of highly cross-‐linked polyethylene:– Net weight gain
• V. Saikko et al, J Biomed Mater Res (Appl Biomater), 63, 2002, p. 848
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Shanbhag et al. 2001 ORS
PARTICLES SEPARATED FROM
WEAR TEST SERUM
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Conventional
Shanbhag et al. 2001 ORS
PARTICLES SEPARATED FROM
WEAR TEST SERUM
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Conventional Crosslinked
Shanbhag et al. 2001 ORS
PARTICLES SEPARATED FROM
WEAR TEST SERUM
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FREE RADICALS
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DEVELOPMENT OF HIGHLY CROSS-‐
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CONCENTRATION OF
0E+00
2,0E+15
4,0E+15
6,0E+15
8,0E+15
Crossfire™
Crossfire™
X3™
X3™
Prolong™
Durasul™
Longevity™
3,00E+137,00E+139,00E+141,10E+15
6,80E+15
4,30E+15
Concen
tration [spins/g] MGH measurements
Stryker measurements
Belowdetection
limit1.0E+13
Stryker measurements: JH Dumbleton et al / CORR 2006vendredi 14 janvier 2011
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IN VIVO OXIDATION OF RETRIEVED XL-‐PE
24 monthsin-vivo
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IN VIVO OXIDATION OF RETRIEVED XL-‐PE
• “The elevated levels of oxidation and crystallinity measured in the retrieved Crossfire components after less than 3 years of in vivo service are unprecedented.”
• K.K. Wannomae, JOA, 21, 2006, p. 1005
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EVALUATION OF OXIDATION AND
• 12 Crossfire acetabular components (Stryker Orthopaedics, Mahwah, NJ).
• Time in vivo: 0.1 – 5.3 years• B.H. Currier et al, JBJS 89A, 2007, p. 2023
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EVALUATION OF OXIDATION AND
• B.H. Currier et al, JBJS 89A, 2007, p. 2023
• Retrieved Crossfire acetabular cups with fatigue damage in the form of rim delamination.
• Severe delamination seen after 2.9 years in vivo.
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EVALUATION OF OXIDATION AND
• B.H. Currier et al, JBJS 89A, 2007, p. 2023
• A thin section of a Crossfire acetabular cup retrieved after 3.3 years in vivo shows a subsurface white band on the rim and the articular surface.
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HEAD PENETRATION
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CLINICAL PERFORMANCE OF A DURASUL
• L.D. Dorr et al, JBJS 87A, 2005, p. 1816
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IN-‐VIVO WEAR ANALYSIS
• Five years experience of highly cross-linked polyethylene in cemented and uncemented sockets: Two randomized studies using RadioStereometric Analysis
• G. Digas et al, ORS 2007, Poster 392
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5-‐YEAR EXPERIENCE OF HIGHLY CROSS-‐
• G. Digas et al, Acta Orthopaedica, 78, 2007, p. 746
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NEW POLYETHYLENES IN TOTAL HIP
• E. Garcia-Rey et al, JBJS, 90-B, 2008, p. 149
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HEAD PENETRATION
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FEMORAL HEAD SIZE AND WEAR OF
• 90 patients (102 hips)– 14 hips with 26 mm heads– 33 hips with 28 mm heads– 35 hips with 32 mm heads– 20 hips with 36 mm or 40 mm heads
• Wear measurement made by Martell’s method• P.F. Lachiewicz et al, CORR, 467, 2009, p. 3290
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FEMORAL HEAD SIZE AND WEAR OF
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FEMORAL HEAD SIZE AND WEAR OF
• “Our study may modify the concept that the wear of electron beam XLPE is independent of femoral head size. Although the linear wear rate was not related to the femoral head diameter, there was a greater volumetric wear rate with the larger heads.”
• P.F. Lachiewicz et al, CORR, 467, 2009, p. 3290
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FEMORAL HEAD SIZE AND WEAR OF
• “Pending long-term studies of large head sizes, we advise caution in using larger femoral heads in young or active patients and in those with a low risk of dislocation.”
• P.F. Lachiewicz et al, CORR, 467, 2009, p. 3290
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THE CREEP AND WEAR OF HIGHLY
• 54 randomised patients– 27 conventional PE– 27 Longevity Trilogy liners
• Wear measurement made by RSA• Minimum follow-up: 3 years• S. Glyn-Jones et al, JBJS, 90B, 2008, p. 556
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THE CREEP AND WEAR OF HIGHLY
• S. Glyn-Jones et al, JBJS, 90B, 2008, p. 556
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WEAR IN CONVENTIONAL AND HIGHLY
• 110 THAs on 102 patients• 80 matched THAs (age and BMI)
– 20 conventional PE– 60 Longevity Trilogy liners
• Two-dimensional head penetration• Minimum follow-up: 5 years• C. Olyslaegers et al, JOA, 23, 2008, p. 489
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WEAR IN CONVENTIONAL AND HIGHLY CROSS-‐LINKED PE CUPS
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WEAR RATE OF HIGHLY CROSS-‐LINKED
• 100 consecutive patients– 50 conventional PE– 50 Longevity Trilogy liners
• Analysis made by the Hip Analysis Suite software• Minimum follow-up: 5.62 years• R.W. McCalden et al, JBJS, 91A, 2009, p. 773
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WEAR RATE OF HIGHLY CROSS-‐LINKED
• Penetration rate:– CPE: 51 µm/yr– XLPE: 3 µm/yr
• The penetration rates differed significantly between the polyethylene groups (p = 0.006).
• R.W. McCalden et al, JBJS, 91A, 2009, p. 773
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WEAR IS REDUCED IN THA PERFORMED
• “Our matched-pair study of 82 hips in young patients at a mean of 5 years (4 - 8 years) follow-up revealed lower wear of HCLPE liners in comparison to CPE liners, with fewer patients having calcar resorption and periprosthetic osteolysis.”
• B. Beksaç et al, CORR, 467, 2009, p. 1765
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THA WITH HIGHLY CROSS-‐LINKED
• 70 THAs on 64 patients• Average age: 41 years (19 – 50 years)• Longevity liners• Martell measurement technique• Average follow-up: 4 years (2.4 – 6.5 years)• D.S. Shia et al, CORR, 467, 2009, p. 2059
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THA WITH HIGHLY CROSS-‐LINKED
• “With the bedding-in phenomenon excluded, the wear rate was-0.036 mm per year, representing undetectable wear at this follow-up.”
• D.S. Shia et al, CORR, 467, 2009, p. 2059
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THA WITH HIGHLY CROSS-‐LINKED
• “We found the early wear rates of this HCLPE in a young patient population are comparable to published data for older populations. In addition, the polyethylene wear rate that we determined was less than that of previously reported conventional polyethylene historic controls. Finally, no patient underwent revision, had evidence of accelerated wear, or had evidence of early failure during the follow-up period.”
• D.S. Shia et al, CORR, 467, 2009, p. 2059
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PARTICLES
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CHARACTERIZATION OF A
• Wear particles were extracted from the serum lubricant after 30 Mc for both the conventional and the HXPE materials
• Equivalent circle diameter (ECD):– Conventional PE: 0.229 ± 0.123 µm– Longevity™: 0.159 ± 0.051 µm– This difference in being statistically significant
• M. Laurent et al, JOA, 23, 2008, p. 751
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CHARACTERIZATION OF A
• M. Laurent et al, JOA, 23, 2008, p. 751
Conventional HXPE
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CHARACTERIZATION OF A
• “The relative number of particles within all particle size ranges generated per million wear cycles was substantially lower for the HXPE than for the conventional material.”
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FAILURES
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FRACTURE OF LONGEVITY™ INSERTS
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RIM CRACKING OF THE CROSS-‐LINKED
• „We reviewed a series of retrieved acetabular liners with a fracture of the superior rim to assess the factors that played a role in their failure.“
• S.S. Tower et al, JBJS 89A, 2007, p. 2212
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RIM CRACKING OF THE CROSS-‐LINKED
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RIM CRACKING OF THE CROSS-‐LINKED
• All the liners have a high abducRon angle (higher than 60º).
• None of the retrieved liners had measurable oxidaRon.
• S.S. Tower et al, JBJS 89A, 2007, p. 2212
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RIM CRACKING OF THE CROSS-‐LINKED
• All the liners have a high abducRon angle (higher than 60º).
• None of the retrieved liners had measurable oxidaRon.
• S.S. Tower et al, JBJS 89A, 2007, p. 2212
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RIM CRACKING OF THE CROSS-‐LINKED
• All the liners have a high abducRon angle (higher than 60º).
• None of the retrieved liners had measurable oxidaRon.
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EARLY FAILURE OF A CROSS-‐LINKED
• „We report the catastrophic failure of a highly cross-‐linked acetabular liner with less than three years of service.“
• K.D. Moore et al, JBJS 90-A, 2008, p. 2499vendredi 14 janvier 2011
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FAILURES
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12 y8 y
10 y 12 y
11 y
7 y
Retrieved conventionnal UHMWPEProf. L. Costa - University of
Torino
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PARTICLES
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NO OR EXTREMELY LOW WEAR DEBRIS
Conventional PEDurasul
10x
40x
• H.G. Willert et al, SBM, 2006, poster 542
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NO OR EXTREMELY LOW WEAR DEBRIS
• “The relative particle concentration for XL-PE ranged between 0.3 . 10-6 and 69.9 . 10-6 (median: 0.5 . 10-6).”
• “In the PE cases, the relative particle concentration ranged between 1.06 . 10-3 and 25.91 . 10-3 (median: 8.25 . 10-3).”
• “This difference is statistically highly significant (Mann-Whitney U test / p = 0.0005).”
• H.G. Willert et al, SBM, 2006, poster 542
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NO OR EXTREMELY LOW WEAR DEBRIS
• H.G. Willert et al, SBM, 2006, poster 542vendredi 14 janvier 2011
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FUNCTIONAL
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WEAR AND BIOLOGICAL ACTIVITY OF XLPE
• GUR 1050 polyethylene• 7.5 and 10.0 MRad gamma irradiation• Re-melting at 155ºC for 24 hours in N2
• 25% new-born calf serum• PROSIM hip simulator – 5 million cycles• A.L. Galvin et al, IMechE – Part H, 221, 2007, p. 1
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WEAR AND BIOLOGICAL ACTIVITY OF XLPE
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WEAR AND BIOLOGICAL ACTIVITY OF XLPE
• “All four materials had very similar Specific Biological Activities (SBA) and there were no statistically significant differences between them.”
• 0.0 MRad: 0.96 7.5 MRad: 0.902.5 MRad: 0.89 10.0 MRad: 0.86
• A.L. Galvin et al, IMechE – Part H, 221, 2007, p. 1
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WEAR AND BIOLOGICAL ACTIVITY OF XLPE
• “However, there was a considerable difference in the Functional Biological Activities (FBA) of the particles. The 10.0 MRad highly cross-linked materials gave the lowest FBA due to their lower wear volume.”
• A.L. Galvin et al, IMechE – Part H, 221, 2007, p. 1
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