Lee JK, et al. - In view of the hypothesis that the revised unicompartmental knee arthroplasty (UKA) group would need additional operative procedures, including the use of stems and augments, resulting in poorer clinical outcomes than those of the primary total knee arthroplasty (TKA) group, experts reviewed the previous studies to compare the revision of UKA to TKA with primary TKA. Longer operation times were seen in the revised UKA to TKA group because of additional procedures such as bone grafting and use of stems and augments, higher reoperation rates, and worse postoperative clinical outcomes based on the Western Ontario and McMaster Universities Osteoarthritis Index and Oxford Knee Score than the primary TKA group, with the differences being statistically significant. Therefore, they suggested that UKA ought not to be considered as an alternative procedure to TKA.