The Journal of Bone and Joint Surgery, Vol 73, Issue 6 848-857, Copyright © 1991 by Journal of Bone and Joint Surgery, Inc
Survivorship analysis of the uncemented porous-coated anatomic knee replacement
CG Moran, IM Pinder, TA Lees and MJ Midwinter
Department of Orthopaedic Surgery, Freeman Hospital, Newcastle upon Tyne, England.
Ninety-six patients who had a total of 108 replacements with an uncemented
porous-coated anatomic knee prosthesis were followed for an average of
sixty-four months (range, thirty-nine to ninety-three months). At the time
of the most recent follow-up, twenty-one implants (19 per cent) had failed,
all due to problems with the tibial component. A patellar component was not
used, and no noteworthy patellar problems were encountered after the
operation. There were no infections about the prostheses, and no femoral
implant was revised. The most common cause of failure was collapse of the
anteromedial part of the tibial plateau, which occurred in fourteen knees.
The prosthesis loosened without collapse of bone in two knees, and five
knees were revised because of gross wear of the polyethylene. When the time
of failure was defined as the point at which revision of the prosthesis was
recommended, the cumulative rate of survival was 84 per cent (95 per cent
confidence interval, +/- 7 per cent) at five years and 77 +/- 10 per cent
at six years. When the time of failure was defined as the point at which
the knee replacement was actually done, the five-year rate of survival was
the same. No significant differences were demonstrated between groups that
were stratified by age, sex, weight, or primary diagnosis. We therefore do
not recommend the use of an uncemented porous-coated anatomic knee
replacement of the design that was evaluated in this study.
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