Background And Purpose: Our institution began using the Kinemax total knee arthroplasty system in 1988, both with and without cement fixation. We report 10-year survival figures.
Methods: Theater records showed that 284 Kinemax total knee arthroplasties had been performed 1988 through 1993. Life-table survival estimates were used to determine the probability of survivorship 10 years after surgery for the total group and by age, sex, diagnosis, and mode of fixation. Median follow-up was 11 (0.8-15) years for unrevised knees in patients who were still alive.
Results: The 10-year cumulative survivorship was higher (93%, 95% CI: 81-97) when both components had been cemented than if either, or both, were uncemented (77%, CI: 67-83; p < 0.001). There was an increased incidence of failure in patients who were less than 60 years of age at the time of surgery (p = 0.004).
Interpretation: The smooth-backed Kinemax knee without cement was found to be associated with a high failure rate at 10 years. The 10-year cumulative survival results of the cemented prosthesis are acceptable.
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