Survival of cementless and cemented porous-coated anatomic knee replacements: retrospective cohort study.

AIM

To evaluate the effect of cement use in porous-coated anatomic (PCA) total knee prosthesis on its survival.

METHODS

The study was a retrospective analysis of 142 PCA total condylar arthroplasties performed in 124 patients from 1985 to 1991. Uncemented prostheses were used in 87 knees, the prostheses were cemented in 44 knees, and hybrid prosthesis components were used in 11 knees. The average follow-up time was 88 months (range 66-140). The survival of prosthesis was assessed using the Kaplan-Meier's method. The Baltimore score was evaluated as a measure of clinical performance in 115 replacements.

RESULTS

The overall cumulative survival rate of a PCA total knee prosthesis was 77% over the average follow-up period of 88 months. No significant differences in survival rates among cementless, cemented, or hybrid fixations could be demonstrated. The survival rate of the prostheses in patients with rheumatoid arthritis (82.5%) was significantly higher than in patients with osteoarthritis (73.8%). Revision was necessary in 29 (20.4%) replacements.

CONCLUSION

The survival of PCA endoprosthesis, regardless of the components used for implantation, is not satisfactory.