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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 degrees). The parameters were statistically analyzed. Results:We found a statistically significant result in joint line to fibula head distance (p=0.01) with an average of 18.8 mm in excellent ROM group compared to 17.5 mm in the good ROM group. Also patellar length / joint line to tibial tubercle ratio difference between the two groups proved statistically significant (p=0.032). Other results included the ranges of all measurements associated with an excellent and good ROM. Conclusion:Better range of motion after TKA is associated with a good control of joint line to fibula head distance and patellar length / joint line to tibial tubercle ratio. Many parameters can withstand a wide range without affecting ROM outcome.

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