Abstract
We report the survivorship of 91 fixed bearing unicompartmental arthroplasties with
all-polyethylene tibial components (Preservation DePuy UK), which were used for medial
compartment osteoarthritis in 79 patients between 2004 and 2007. The satisfaction
level of patients who had not undergone revision of the implant was also recorded.
For comparison, we reviewed 49 mobile bearing unicompartmental arthroplasties (Oxford
UKA Biomet UK Ltd), which had been used in 44 patients between 1998 and 2007. Mean
length of follow-up of patients with the fixed bearing implant was 44.7 months (range 24–74 months) and for the mobile bearing replacement, the mean follow-up was 67.6 months (24–119). In the fixed bearing design, at maximum follow-up period of 74 months, eight implants (8.8%) had been revised (or were listed for revision) to Total
Knee Replacement and in the mobile bearing design over the maximum follow-up period
of 119 months there had been only one revision (2.0%). Patients who had not undergone revision
were asked if they were satisfied with their knee following the unicompartmental arthroplasty.
In the fixed bearing design, 83.5% said that they were satisfied with the outcome
of the operation compared to 93.9% of the patients receiving the mobile bearing design.
We conclude that there is a higher incidence of revision of this fixed bearing design
using an all-polyethylene tibial component compared to the mobile bearing design.
We found that those patients who had not required revision had a lower rate of satisfaction
with the fixed bearing compared to the mobile bearing design.
Keywords
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Article info
Publication history
Published online: June 07, 2011
Accepted:
April 26,
2011
Received in revised form:
April 22,
2011
Received:
January 11,
2011
Identification
Copyright
© 2011 Elsevier B.V. Published by Elsevier Inc. All rights reserved.
