This paper describes micro-Raman spectroscopy of ultra-high molecular weight polyethylene wear debris isolated from revised knee replacements. The novel application of micro-Raman spectroscopy to the analysis of in vivo-generated wear debris was used to evaluate the chemical nature of individual, retrieved polyethylene particles. The analysis revealed the presence of beta-carotene on particles ...

In this paper, the biomedical grade Ultra High Molecular Weight Polyethylene (UHMWPE) has been soaked at different temperatures in Simulated Synovial Fluid (SSF); diffusion coefficient, hardness, roughness and wettability evaluated. Then, 37°C (body temperature) soaked-polyethylene sample was aged 80°C monitored by InfraRed spectroscopy (oxidation trackers) GPC (for molar mass changes) to obser...

We studied wear in the ultra-high-molecular-weight polyethylene offset bore socket in 54 hips which had had Charnley low-friction arthroplasty. At an average follow-up of 8.1 years, the mean penetration rate was 0.04 mm per year. Correlation between the depth of socket penetration and the incidence of socket migration was confirmed, but socket migration occurred with lower penetration than had ...

A composite hip prosthesis (CHP) made from alumina reinforced ultra high molecular weight polyethylene (UHMWPE) was designed and manufactured. The main objective of the study was to fabricate the composite hip prosthesis which would be an ideal replacement of metallic one as bone is a composite material consisting of collagen fibre matrix and embedded hydroxyapatite mineral. With this idea we d...

Laboratory wear testing of ultra high molecular weight polyethylene from 12 Charnley acetabular cups, removed after periods of up to 17.5 years showed that the large patient-to-patient variations in clinical penetration rate cannot be explained by batch-to-batch variation in the wear resistance of the material. Nor was there any evidence of a time-dependent degradation in wear resistance of the...

Abstract The mechanical response behavior and multi-scale simulation methods of organic ballistic fibers were summarized in this paper, including aramid fibers, ultra-high molecular weight polyethylene their composites. Simulation are summarized, the current common problems analyzed article. author is convinced that application with core-skin structure can effectively predict macroscopic proper...