scholarly journals Does the addition of vitamin E to conventional UHMWPE improve the wear performance of hip acetabular cups? Micro-Raman characterization of differently processed polyethylene acetabular cups worn on a hip joint simulator

2020 ◽  
Vol 53 (10) ◽  
Author(s):  
M. Di Foggia ◽  
S. Affatato ◽  
P. Taddei
Keyword(s):  
Vitamin E ◽  
Hip Joint ◽  
Wear Performance ◽  
Hip Joint Simulator ◽  
Raman Characterization

Biotribological behaviour of Vitamin E-blended highly cross-linked UHMWPE in a hip joint simulator

2016 ◽  
Vol 68 (5) ◽  
pp. 548-553 ◽  
Author(s):  
Guomei Chen ◽  
Zifeng Ni ◽  
Shanhua Qian ◽  
Yongwu Zhao
Keyword(s):  
Wear Resistance ◽  
Vitamin E ◽  
Hip Joint ◽  
Oxidative Degradation ◽  
Test Environment ◽  
Content Type ◽  
Artificial Hip Joint ◽  
Hip Simulator ◽  
Directional Motion ◽  
Hip Joint Simulator

Purpose The purposes of this paper are to investigate the biotribological behaviour of Vitamin E-blended highly cross-linked ultra-high molecular weight polyethylene (HXL-UHMWPE) under multi-directional motion by using a CUMT II artificial joint hip simulator and compare it with HXL-UHMWPE and conventional UHMWPE. Design/methodology/approach The biotribological behaviour of conventional, highly cross-linked and Vitamin E-blended highly cross-linked UHMWPE acetabular cups counterfaced with CoCrMo alloy femoral head under multi-directional motion were investigated by using CUMT-II artificial hip joint simulator for one-million walking cycles. The test environment was at 36.5 ± 0.5°C and 25 per cent bovine serum was used as lubricant. A Paul cycle load with a peak of 784 N was applied; the motion and loading were synchronized at 1 Hz. Findings The wear resistance of Vitamin E-blended highly cross-linked UHMWPE was significantly higher than that of highly cross-linked and conventional UHMWPE. The wear marks observed from the worn surface of UHMWPE were multi-directional, with no dominant wear direction. Only abrasion occurred on the surface of Vitamin E-blended highly cross-linked UHMWPE, while yielding and accumulated plastic flow processes occurred on the surface of conventional UHMWPE and flaking-like facture and abrasion occurred on the surface of highly cross-linked UHMWPE. Originality/value Besides the prevention of oxidative degradation, blending with Vitamin E can also reduce the incidence of fatigue crack occurred in the surface layer of HXL-UHMWPE samples. Therefore, the wear resistance of HXL-UHMWPE under multi-directional motion can be further enhanced by blending with Vitamin E.

scholarly journals In Vitro Analysis of Wearing of Hip Joint Prostheses Composed of Different Contact Materials

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3805
Author(s):  
Jian Su ◽  
Jian-Jun Wang ◽  
Shi-Tong Yan ◽  
Min Zhang ◽  
Hui-Zhi Wang ◽  
...  
Keyword(s):  
Cost Effectiveness ◽  
Vitamin E ◽  
Femoral Head ◽  
Wear Rate ◽  
Hip Joint ◽  
Cobalt Chromium ◽  
Significant Difference ◽  
Joint Prostheses ◽  
Hip Joint Simulator

Cobalt-chromium-molybdenum alloy (CoCrMo) and ceramic are the two most common materials for the femoral head in hip joint prostheses, and the acetabular liner is typically made from ultra-high molecular weight polyethylene (UHMWPE), highly cross-linked polyethylene (XLPE), or highly cross-linked polyethylene blended with Vitamin E (VEXLPE). The selection of suitable materials should consider both wear performance and cost-effectiveness. This study compared the wear rate between different friction pairs using a hip joint simulator and then recommended a suitable prosthesis based on the corresponding processing technology and cost. All wear simulations were performed in accordance with ISO 14242, using the same hip joint simulator and same test conditions. This study found that when using the same material for the femoral head, the XLPE and VEXLPE liners had a lower wear rate than the UHMWPE liners, and the wear rate of the XLPE liners increased after blending with Vitamin E (VEXLPE). There was no significant difference in the wear rate of XLPE when using a CoCrMo or ceramic head. Considering the wear rate and cost-effectiveness, a CoCrMo femoral head with an accompanying XLPE liner is recommended as the more suitable combination for hip prostheses.

Raman characterization of phonon confinement and strain effects from latent ion tracks in α‐quartz

2021 ◽  
Author(s):  
Maria C. Garcia Toro ◽  
Miguel L. Crespillo ◽  
Jose Olivares ◽  
Joseph T. Graham
Keyword(s):  
Phonon Confinement ◽  
Strain Effects ◽  
Ion Tracks ◽  
Raman Characterization

scholarly journals Macroscopical, histological and in vitro characterization of non-osteoarthritic versus osteoarthritic hip joint cartilage and complement expression

2016 ◽  
Vol 24 ◽  
pp. S159-S160
Author(s):  
G.G. Schulze-Tanzil ◽  
J. Badendick ◽  
O. Godkin ◽  
B. Kohl ◽  
M. Jagielski ◽  
...  
Keyword(s):  
Hip Joint ◽  
Joint Cartilage ◽  
In Vitro Characterization

scholarly journals Synthesis and Magnetic Characterization of Graphite-Coated Iron Nanoparticles

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
A. M. Espinoza-Rivas ◽  
M. A. Pérez-Guzmán ◽  
R. Ortega-Amaya ◽  
J. Santoyo-Salazar ◽  
C. D. Gutiérrez-Lazos ◽  
...  
Keyword(s):  
Magnetite Nanoparticles ◽  
Iron Nanoparticles ◽  
Vapour Deposition ◽  
Magnetic Measurements ◽  
Chemical Vapour ◽  
Hydrogen Atmosphere ◽  
Iron Core ◽  
Carbon Excess ◽  
Raman Characterization

Graphite-coated iron nanoparticles were prepared from magnetite nanoparticles by chemical vapour deposition (CVD) under methane and hydrogen atmosphere. After being purified from carbon excess, graphite-coated iron nanoparticles were tested for morphological and magnetic properties. It was found that, during the thermal process, magnetite nanoparticles 6 nm in size coalesce and transform into graphite-coated iron 200 nm in size, as revealed by scanning electron microscopy (SEM). Raman characterization assessed that high-quality graphite coats the iron core. Magnetic measurements revealed the phase change (magnetite to iron) as an increase in the saturation magnetization from 50 to 165 emu/g after the CVD process.

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