Reza Tavakoli Darestani - Department of Orthopedic and Trauma Surgery, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Ali Reza Manafi - Department of Orthopedics,imam hosein Hospital, Medical school, Shahid Beheshti University of medical sciences, Tehran, Iran
Hamidreza Baranzehi - Department of Orthopedic and Trauma Surgery, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Mohammad Mahdi Omidian - Department of Orthopedic and Trauma Surgery, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Hasan Barati - Department of Orthopedic and Trauma Surgery, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Mojtaba Baroutkoub - ۱Department of Orthopedic and Trauma Surgery, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Farzad Amouzadeh Omrani - Department of Orthopedic and Trauma Surgery, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Shahram Sayadi - MD,Anesthesiology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Ahmadreza Mirbolook - Department of Orthopedic and Trauma Surgery, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Background: In the elderly, proximal humerus fractures are not unusual. The treatment of these injuries are often complicated.Objectives: This study aimed to evaluate the effect of deltoid tuberosity index on the outcome of proximal humeral fractures treated with a locking plate.Methods: One hundred consecutive patients with displaced fractures of the proximal humerus had open-reduction and internal fixation using a locking plate. The patients were divided into two main groups (low density group) DTI<۱.۴ and DTI>۱.۴ (normal density group) and at the end of the study, treatment and failure were assessed in the two groups.Results: In this study, ۱۰۰ patients with proximal humeral fracture who were candidates for locking plating surgery were evaluated. The mean of DTI in all patients was ۱.۴۸ with a minimum of ۱.۱۰ and a maximum of ۲.۲۰. Based on the Pearson correlation coefficient, with increasing age, the constant score decreased in the studied patients, which was statistically significant (r=-۰.۲۱۶, p-value = ۰.۰۳۱). Also, in patients with DTI less than ۱.۴ and more than ۱.۴, the Constant score was ۷۳.۰۲ and ۷۷.۸۸, respectively. This difference was not statistically significant (p-value=۰.۰۵۴). There was a statistically significant relationship between Constant Score, DTI and patients' gender (p-value≤۰.۰۵). While there was no statistically significant relationship between fracture type and constant score. Pearson correlation coefficient between DTI and age of patients was -۰.۳۰, which decreased with increasing age of patients. This was statistically significant (r=-۰.۳۰, p-value=۰.۰۰۳).Conclusion: The results of this study show that the deltoid tuberosity index can be effective on proximal humoral fracture surgery treated with locking plating.

Deltoid Tuberosity Index, Proximal Humerus Fractures, constant score