Publications & Reports

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Fracture Behavior of Shelf-Aged Tibial Components

Researchers from Zaragoza and Madrid have studied the fracture behavior of UHMWPE knee components that were shelf aged in air for 6 to 7 years following sterilization. Mechanical measurements and fracture morphology in the subsurface region confirmed the embrittlement of oxidized UHMWPE.

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High Pressure Crystallization of Crosslinked UHMWPE

Researchers from Brigham & Women's Hospital and Berkeley have developed high pressure processing techniques for highly crosslinked UHMWPE, marrying the fatigue resistance obtained from high pressure crystalization with the wear resistance obtained from crosslinking. This paper was presented on Sept. 19, 2003, at the UHMWPE meeting at the University of Torino.

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Biological Response to Wear Debris

Researchers from the University of Leeds have summarized their research to determine the functional biological activity of in vitro-generated wear debris particles. This paper was presented on Sept. 19, 2003, at the UHMWPE meeting at the University of Torino.

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UHMWPE Processing: Techniques and Problems

In this review, Mark Allen from Perplas Ltd. (Bacup, England) provides a coverter's perspective of the challenges related to processing of UHMWPE. This paper was presented on Sept. 19, 2003, at the UHMWPE meeting at the University of Torino.

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Historical Review: Discovery of Polyethylene

This paper provides an intimate and detailed account of the historical development of polyethylene, including UHMWPE. This paper was presented on Sept. 19, 2003, at the UHMWPE meeting at the University of Torino.

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Oxidation and Stabilization of UHMWPE

Researchers at the University of Turino have written a review summarizing the mechanisms of oxidation and stabilization of UHMWPE using Vitamin E. This paper was presented on Sept. 19, 2003, at the UHMWPE meeting at the University of Torino.

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Simulation of Unloading and Cyclic Loading

A previously developed hybrid constitutive model has been augmented to allow also for accurate predictions of the unloading behavior of conventional and highly crosslinked UHMWPE during cyclic loading. It is shown that the augmented hybrid model accurately captures the experimentally observed characteristics of uniaxial cyclic loading, large strain tension, rate-effects, and multiaxial deformation histories.

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Mechanical Property Degradation Following Long-Term Implantation

In this study, researchers evaluated 16 consecutive traceable Hexloc acetabular components implanted on average 11.5y. The results of this study strongly support the hypothesis that the degradation of mechanical properties for the liners occurred during implantation.

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Failure Micromechanisms in Conventional and Highly Crosslinked UHMWPE

The goals of this study were to evaluate the micromechanisms of failure under uniaxial tension and to determine the effect of gamma radiation-induced crosslinking and post-irradiation thermal processing on the estimated fracture toughness (Kc) of UHMWPE. Reseachers observed the same basic failure mechanism for all of the conventional and highly crosslinked UHMWPE specimens.

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Comparison of Annealed Crosslinked and Conventional UHMWPE

This paper reviews the choices available to an implant designer when developing a highly crosslinked UHMWPE as an orthopaedic bearing material. The authors suggest that the application of annealing rather than remelting in the thermal processing step allows the retention of important mechanical properties in the finished material.

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