Purpose: The aim of this study was to evaluate the effect of surgical treatment of extensor tendon injuries in the hand with appropriate primary repair techniques on clinical and functional outcomes, taking into account the mechanism of injury, concomitant injuries and injury sites. Materials and Methods: This is a cross-sectional study in which 103 patients who were operated between 2016-2020 in Orthopedics and Traumatology Clinic were evaluated retrospectively. Existing treatment modalities were evaluated in terms of etiological factors, anatomical regions, number of injured tendons, and injuries. Complications and functional outcomes were statistically evaluated according to anatomical regions, mechanism of injury and additional injuries. Results: 114 extensor tendon injuries of 103 patients (mean age: 37.2 years) were evaluated. The mean follow-up period was 26.8 months. Among the etiological factors, it is seen that the most common one is sharp object injury (57.3%). According to the Miller classification performed at the 8th week and 12th month in sharp object injury, moderate and poor outcome and the presence of complications were found to be statistically significantly lower than other injury types. A statistical correlation was observed between the accompanying injury (n: 21/103) and the occurrence of complications and functional outcomes. While there is no difference between complications, depending on the body regions, and functional results at 8. week statistically significantly lower functional results were found in zone-2 injuries at 12 months. Conclusion: While successful postoperative recovery primarily depends on the type of injury and associated injuries, good and excellent functional results can be achieved with early mobilization after surgery with the appropriate repair technique in any region.