Little Differences in Outcomes Between Sexes Using a Contemporary Total Knee System

A great deal of interest has recently been focused on sex-specific knees. We reviewed 1970 Sigma knees in 1512 patients. There were 920 women and 592 men. Average age was 69.7 years for the group. Preoperative diagnosis was OA in 96%.We found, at minimum, 5-year follow-up and average 8-year follow-up minimum differences in outcomes between men and women. No significant differences were seen in either range of motion, function, or pain scores between the 2 groups. The only significant finding was that men did demonstrate more osteolysis at final follow-up (3.4% vs 1%), and this was statistically significant. Ten-year survivorship estimates were 97.8% for men and 96.9% for women (P = .96). We concluded that we could identify little differences between sexes in this large series using a modern unisex knee system.