Abstract
Twenty-four Kinemax total knee arthroplasties (TKAs), performed in 19 patients with rheumatoid arthritis in 1991, were studied for a period of 5-7 years (mean, 6.4 years) . Three patients (5 knees) died and five patients (5 knees) were lost to follow-up. Eleven patients (14 knees) were available for this study. Nine cementless TKAs were performed in seven patients, and five cemented TKAs were performed in five patients. Patients were 49-60 years old at operation (mean, 56.2 years old) . The mean preoperative and postoperative JOA-RA knee scores were 48.8 and 68.0 for the cementless group compared to 30.2 and 63.6 for cemented group. The difference of postoperative score was not significant. Early subsidence of the tibial component was noted in three cementless knees, one of which required revision 5.5 years after primary TKA because of severe gonalgia. There was no subsidence in any of the cemented TKA. Neither loosening nor infection was noted in either the cementless or cemented knees. These findings suggest that cementless fixation is not preferable in Kinemax TKA.
