284 press-fit Kinemax total knee arthroplasties followed for 10 years: poor survival of uncemented prostheses.
OBJECTIVE
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).


CONCLUSIONS
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.
Cloke
David J
DJ
Department of Orthopaedics, Freeman Hospital, High Heaton, Newcastle-upon-Tyne, UK. clokes@talktalk.net
Khatri
Manoj
M
Pinder
Ian M
IM
McCaskie
Andrew W
AW
Lingard
Elizabeth A
EA
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects / Q000379:methods; D002484:Cementation; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007720:Knee Prosthesis / Q000009:adverse effects; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery; D011475:Prosthesis Failure; D016459:Prosthesis-Related Infections / Q000209:etiology; D012086:Reoperation