Journal of Surgery - JuniperPublishers Abstract Background: Achieving full range of motion (ROM) is one of the most important goals in total knee replacement (TKA). The aim of this study was to identify surgical-dependent factors that are correlated to a full ROM. Methods: Between August 2013 and July 2014, on 227 total knee replacements (132 patients), who were assessed for range of motion at least one month postoperatively, x-ray measurements were performed. We have included patient demographics (sex, age, body mass index and preoperative range of motion), type of TKA, as well as radiographic measurements including patella length, patellar height, Insall-Salvati Ratio, joint line to patella distance, joint line to tibial tubercle distance, joint line to fibula distance, joint line to medial epicondyle distance and other ratios. The total knee replacements were divided into two groups, an excellent ROM group (more than 130 degrees) and a good ROM group (between 110 and 129