Novel route to fatigue-resistant fully sintered ultrahigh molecular weight polyethylene for knee prosthesis

S. Rastogi, L. Kurelec, D. Lippits, J. Cuijpers, M. Wimmer, P. J. Lemstra

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The role of entanglements in obtaining a homogeneous product of ultrahigh molecular weight polyethylene (UHMW-PE) has been explored. Studies performed in this report show that a disentangled state before melting is a prerequisite to obtain homogeneous products of an intractable polymer like UHMW-PE. The disentangled state is obtained directly from the reactor by controlling the polymerization conditions or in the solid state when there is enhanced chain mobility along the c axis of a unit cell. The disentangled state is maintained in the melt over a period of time, invoking implications in polymer rheology. This approach is applicable to polymers in general. The homogeneous fully sintered UHMW-PE, obtained for the first time, shows a considerable decrease in oxygen permeability and an increase in toughness and fatigue resistance. Such homogeneous products of UHMW-PE are beneficial in highly demanding applications, especially in knee prosthesis, where the polymer is used as an inlay between the human bone and a metal or ceramic part, which slides against the polyethylene component during normal gait. © 2005 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)942-947
Number of pages6
JournalBiomacromolecules
Volume6
Issue number2
DOIs
StatePublished - Mar 1 2005
Externally publishedYes

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