Introduction: Volleyball is considered one of the most exciting and popular sports throughout the world and as this has rapid and explosive movements in various directions, the size of the forces involved in such movements can result in injuries. Regarding this, the study tried to examine the injuries and the degree of disability pain, particularly in specialized volleyball positions in the eighth most harmful sport in the world of sports.

Materials and Methods: The study was retrospective descriptive examining the acute injury, chronic injury, and the pain and disability among the players. The population was all the elite players of the Premier League of Iranian boys' youth volleyball. The number of players willing to cooperate in this study was 81. Data was collected by the interviewer using Cornell and Nordic questionnaires and then the collected data was analyzed using descriptive statistical tests in SPSS 24 and Excel software.

Results: The highest rates of acute and chronic injuries regarding the specialized position of the players were in the position (opposite) in the shoulders at 23.61 and 33.33% of the total, respectively, in the position of libero in the back area, respectively, as 15.87 and 8.33% of the total. Moreover, the rates of these injuries - acute and chronic - in outside hitter position were in the arm and elbow at 71.11 and 80% of the total, respectively, in the setter position in the back area at 16.67 and 25% of the total, and finally in the middle blocker position, the highest rate of acute injury was in the neck area with 47.78% and chronic injury in the ankle and thigh as 66.67% of the total. However, overall, the most injury belongs to the positions of outside hitter and middle blocker. However, the highest percentage of pain and disability were related to musculoskeletal problems in the lower limbs was 40.45% of the total pain and disability and in the lower limbs the highest pain and disability was observed in the knees with 20.58%. The second rate of pain and disability was in the upper limbs of athletes as 35.08%. The highest pain and disability was observed with a large difference of 18.43% in the shoulders, then 18.22% in the trunk and 13.53% in the waist.

Conclusion: By studying the prevalence of injuries to athletes in specialized positions of each sport, one can plan athletes' training programs to prevent injuries and even enhance them creating better efficiency for them.

Keywords: Volleyball, musculoskeletal injury, pain and disability