Mean postoperative follow-up was 3.2 years (range, 2-5 years). Comorbidities, medical complications, transfusion rate, and length stay were not different between groups (P < .05). Comorbidities and complications had no influence on the outcomes. There were no significant differences in preoperative knee KSS, WOMAC, or SF-12 mental scores, but octogenarians had significantly lower functional KSS (P = .003) and SF-12 physical scores (P = .005). At the last follow-up, there were no significant differences in KSS, WOMAC, and SF-12 physical scores (P < .05), but octogenarians had higher SF-12 mental (P = .030) and satisfaction (P = .031) scores.