14 randomized controlled trials reporting postoperative range of motion outcomes were selected for inclusion in this meta-analysis. The purpose of this study was to analyze the clinical outcomes of high-flex total knee arthroplasty (TKA) as compared to conventional prostheses in an updated meta-analysis of high-quality clinical trials. Results found that the high-flex TKA group displayed 2 degrees more mean max knee flexion and improvements in knee society score. However, It should be noted that the improvements were minute and may not represent clinically significant findings. No significant differences were noted in the hospital for special surgery scores, SF-36, complications, or revisions.