Title: Comparative gravimetric wear analysis in mobile versus fixed-bearing posterior stabilized total knee prosthesis
Authors: Delport, Hendrik ×
Vander Sloten, Jozef
Bellemans, Johan #
Issue Date: Jun-2010
Publisher: Acta Medica Belgica
Series Title: Acta Orthopaedica Belgica vol:76 issue:3 pages:367-373
Abstract: Polyethylene (PE) wear is the limiting factor for the
longevity of a conventional total knee arthroplasty
(TKA). Excessive wear leads to loosening and even -
tual implant failure. The aim of our in vitro study was
to investigate wear of a PE tibial insert on a rotating
platform as compared to the same insert fixed to the
tibial baseplate and articulating with a similar
femoral component. All tests were performed at
Endolab Laboratories, Rosenheim, Germany using a
knee joint simulator following ISO 14243-1. Three
specific configurations were tested and compared to a
loaded soak control : (1) the rotating platform using
machined polyethylene (PE), (2) fixed bearing using
machined PE, (3) fixed bearing using compressionmoulded
Calf serum with a high protein concentration of 30 g/l
was chosen as test lubricant. PE wear was measured
gravimetrically using the ISO 14243-2 protocol.
The total wear rates found for all systems tested were
low. The mean wear rate was 1.40 mg per million
cycles for the moulded fixed bearing, 4.07 mg per million
cycles for the machined fixed bearing type and
0.82 mg per million cycles for the machined rotating
platform bearing type. We conclude that the TKA
system we tested (Performance®, Biomet, Warsaw,
IND, USA) demonstrated very low gravimetric wear.
The wear rate of the same implant in the fixed mode
compared to the rotating platform mode was four
times higher.
ISSN: 0001-6462
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Orthopaedics Section (-)
Biomechanics Section
× corresponding author
# (joint) last author

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