Uncemented rotating-platform total knee arthroplasty: a 4-year to 12-year follow-up.

One hundred nine primary uncemented, rotating-platform, low-contact stress total knee arthroplasties in 85 patients were reviewed 4 to 12 years after the operation as a prospective study on consecutive cases. All patients were followed up annually with subjective questionnaires and radiological assessment. At the time of final review, 69 patients with 87 rotating-platform total knee arthroplasties were still alive. All were reviewed at the final follow-up using the American Knee Society Score (clinical and radiological). The average knee score was 86.42, and the average functional score was 65.1. No evidence of radiological loosening was observed in any patient. One knee was revised because of medial collateral ligament laxity. The 10-year survival rate was 99.08%.