Obesity is a growing epidemic in developed countries. Which lead to increase the percentage of obese people in the orthopedic trauma population and concern patients postoperative period. Lower extremity long-bone fractures are among the most common fractures and are associated with significant complications, prolonged hospitalization, and a heavy financial burden on the community health network.Methods: In this cohort study, all patients with lower extremity long-bone fractures treated in Bahonar Hospital in Kerman were included using the simple sampling method and divided into two groups based on BMI (BMI greater than or equal to 30 were considered obese, and people with a BMI less than 30 as non-obese) and followed for one year after treatment.Results: Our study was conducted on two groups, each including 65 people, of obese and non-obese people with lower extremity fractures. In statistical studies, no significant difference was found between the obese and non-obese groups in terms of underlying disease (P = 0.1), fracture site (P = 0.13), open or closed fracture (P = 0.283), type of surgery (P = 0.217), and fracture complications (P = 0.699).Conclusion:There is no significant relationship between the complications of lower extremity long bone fractures of obese and non-obese people; it seems that mostly systemic complications should be considered in obese people after fractures. Finally, considering the differences between the results of this and similar studies and genetic and ethnic differences in other parts of Iran, further studies in this field with larger sample sizes in different geographical locations are recommended.