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Martes, 8 de abril Tuesday, 8th April CADERA / HIP Pares de fricción y nuevos materiales Fijación de los componentes protésicos Doble cúpula y vástago corto Friction couple and new materials Fixation of the prosthetic components Resurfacing and short stem Moderadores / Moderators: Victor M. Goldberg, Cecil Rorabeck, Luis Azorín,
MARTES / TUESDAY 14 09.00 - 10.45 h CADERA / HIP Pares de fricción y nuevos materiales / Friction couple and new materials Moderador: Victor M. Goldberg STUDY OF WEAR BEHAVIOR IN A HIP JOINT SIMULATOR OF DIFFERENT CoCrMo COUNTERFACES ON UHMWPE F. Javier Gil CREB. Dept. Ciencia de Materiales e Ingeniería Metalúrgica. ETSEIB. Universidad Politécnica de Cataluña. Barcelona (Spain) The objective in these wear tests was to study the effect of different material counterfaces on the UHMWPE wear behaviour. The materials used as counterfaces were based on CoCrMo: forged with hand polished and mass finished, CoCrMo coating applied on the forged CoCrMo alloy obtained by Physical Vapour Deposition (PVD). A Hip Joint Simulator have been designed and built for these studies. The worn surfaces were observed by optical and scanning electron microscopy. The results show that the hand polished CoCrMo alloy caused the higher UHMWPE wear of the acetabular cups. The CoCrMo coating causes the least UHMWPE wear, while the mass finished CoCrMo alloy causes an intermediate UHMWPE wear. MATERIAL AND METHODS The tests on the HJS wear test method were performed as follows (Figure 1). The acetabular cups were mounted on a home-made metal back support to transmit the load to each of the three stations. The cups were then pressed against the femoral heads. While the cups remains static, the heads slides according to the biaxial rocking motion. A constant load of 1000 N (102 Kg) per station was applied during the test. The frequency of the motion was 1.23 Hz (810 ms/cycle). In the HJS a cycle is considered as completion of one rotation of the head. The wear of the UHMWPE cups was determined by weight loss measurements every 333,333 cycles up to a total test length of 3 million cycles. The test lubricant was replaced with fresh solution after every weighing stop and distilled water was added during the test for compensating water evaporation. Each station has an environmental test chamber made of a transparent polycarbonate wall. Each chamber has been filled with 350 ml of lubricant. As test lubricant, a solution consisting of bovine serum and distilled water was used with a total protein concentration of 30 mg/ml. The serum was purchased at Sigma-Aldrich SrI (Calf serum, bovine donor; product No.C9676). The soak adsorption of the UHMWPE cups was determined using an additional control cup, which was loaded identically as the UHMWPE cups in the RPOF machine, but no motion was applied. The cleaning and drying of the UHMWPE cups was performed according to the ASTM 1715 standard. Weighing was carried out with a Mettler Toledo AT261DeltaRange® microbalance with an accuracy of 10±µg. Acetabular cups made of UHMWPE GUR1020 and previously sterilised with 25 KGy (2.5 Mrad) gamma radiation were used. The cups were supplied by the SAMO S.p.A. and received with their packaging, as they are commercialised. The cups are designed to be used with a metal back component and in conjunction with 28 mm femoral heads. The articulating counterfaces were therefore 28 mm femoral heads. Three different femoral head materials were studied, the standard material in this study was a hot-forged CoCrMo alloy. Table shows the chemical composition of this material and Table 2 the hardness and roughness of each material. · CoCrMo forged (hand polished) · CoCrMo forged (mass finished) · CoCrMo forged with a CoCrMo coating obtained by means of physical vapour deposition (PVD). The coating had the same chemical composition as the substrate. For each articulating counterface material three heads were tested. A total of 18 wear tests were performed. The test conditions and materials for the HJS wear tests are resumed in Table 3. RESULTS AND DISCUSSION The wear of the UHMWPE specimens (cups) in the HJS wear test method are shown in Figure 2, where the volumetric wear (mm3) of the UHMWPE cups is represented as a function of test duration in cycles for each the head material. The volumetric wear results are calculated from the average weight loss of three specimens. The results shown above after 3 million cycles present a high linearity and a low standard deviation. The standard deviation after 3 million cycles, represents for the hand polished alloy and the CoCrMo coating 10.20% and 4.66% respectively, and 6.95% for the mass finished alloy.
Page 1: VI Curso Internacional de Artroplas
Page 4 and 5: LIBRO DE RESÚMENES / ABSTRACT BOOK
Page 6: El Curso Internacional de Artroplas
Page 10 and 11: Índice Ponentes Speakers Index VI
Page 12 and 13: Lawrence Dorr - MIS THR: why, how a
Page 14: Laurent Sedel - Ceramic - ceramic c
Page 19 and 20: MARTES / TUESDAY 16 The results pre
Page 21 and 22: MARTES / TUESDAY 18 METAL-METAL COU
Page 23 and 24: MARTES / TUESDAY 20 METHOD Forty-on
Page 25 and 26: MARTES / TUESDAY 22 Los sistemas po
Page 27 and 28: MARTES / TUESDAY 24 11.15 - 15.35 h
Page 29 and 30: MARTES / TUESDAY 26 interlock betwe
Page 31 and 32: MARTES / TUESDAY 28 PRÓTESIS MODUL
Page 33 and 34: MARTES / TUESDAY 30 ACETABULAR FIXA
Page 35 and 36: MARTES / TUESDAY 32 center is only
Page 37 and 38: MARTES / TUESDAY 34 mm steps and ev
Page 39 and 40: MARTES / TUESDAY 36 15.50 - 19.35 h
Page 41 and 42: MARTES / TUESDAY 38 REFERENCES - Eb
Page 43 and 44: MARTES / TUESDAY 40 HOW SMALL CHANG
Page 45 and 46: MARTES / TUESDAY 42 HIP RESURFACING
Page 47 and 48: MARTES / TUESDAY 44 INDICATIONS AND
Page 49 and 50: MARTES / TUESDAY 46 a disturbed blo
Page 52 and 53: Miércoles, 9 de abril Wednesday, 9
Page 54 and 55: Notas / Notes MIÉRCOLES / WEDNESDA
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Notas / Notes MIÉRCOLES / WEDNESDA
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JUEVES / THURSDAY 106 08.30 - 10.45
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JUEVES / THURSDAY 108 component pos
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JUEVES / THURSDAY 110 Por la única
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JUEVES / THURSDAY 112 ANILLOS DE SO
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JUEVES / THURSDAY 114 múltiples pe
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JUEVES / THURSDAY 116 las 2, la got
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JUEVES / THURSDAY 118 throplasty. J
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JUEVES / THURSDAY 124 Marrow stimul
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JUEVES / THURSDAY 126 Results bette
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JUEVES / THURSDAY 128 RESULTS MCKEE
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JUEVES / THURSDAY 130 minimal erosi
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JUEVES / THURSDAY 132 Last but not
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JUEVES / THURSDAY 134 motion, absen
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JUEVES / THURSDAY 138 to numb areas
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JUEVES / THURSDAY 142 to be detrime
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JUEVES / THURSDAY 144 2. Burnett RS
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Viernes, 11 de abril Friday, 11th A
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