Background: The reported results of the Optetrak posterior stabilized total knee prosthesis, which is a modification of the Insall-Burstein knee prosthesis, are inconsistent. We determined whether the design changes of this posterior stabilized fixed-bearing knee prosthesis have achieved their intended objectives at minimum 10-year follow-up. Furthermore, we intended to delineate the specific features to which we attribute to the good outcomes of these Optetrak knee prosthesis.
Methods: These were 131 patients (mean age, 68.1 years). The mean follow-up was 10.4 years (range, 11-12 years). The patients were assessed clinically and radiographically with rating systems of the Knee Society. In addition, Western Ontario and McMaster Universities Osteoarthritis (WOMAC) questionnaire, UCLA (University of California at Los Angeles) activity score were determined preoperatively and at each follow-up.
Findings: The mean Knee Society knee score was 91 points (range, 70-100 points) at the final follow-up. The mean WOMAC score was 15 points (range, 4-56 points), and the mean UCLA activity score was 6.2 points (range, 4-8 points) at the final follow-up. No knee had an aseptic loosening of the components or osteolysis. The predicted implant survival at 10.4 years was 99% as the end point of any reoperation.
Conclusions: The findings of the present 10.4-year clinical study suggest that Optetrak posterior stabilized fixedbearing cemented prosthesis obtained favorable clinical and radiographic results.
Young-Hoo Kim, Jang-Won Park and Jun-Shik Kim