Risk factors that predict severe injuries in university rugby sevens players

Objectives: To investigate injury incidence and the influence of physical fitness parameters on the risk of severe injuries in players on rugby sevens university teams. Design: Prospective cohort study. Methods: Rugby players from three universities (N = 104; 90M:14F; 20.6 +/- 1.9 years) were recruited before the beginning of the season. Players underwent pre-season assessments of power, strength, speed, agility, endurance, stability, and flexibility. Throughout the season, rugby-related injury and exposure data were collected. Potential predictor variables were analyzed using Cox proportional regression model to identify risk factors associated with severe injuries (time loss > 28 days). Results: Thirty-one injuries occurred during the rugby season. The match and training injury incidence rates were 59.3 injuries and 3.3 injuries per 1000 player-hours, respectively. Lower limb injuries were most common and most severe. The ankle joint was the most prevalent site of injury, and ligamentous injury was most common (48.4%). Nine severe injuries were sustained resulting in an average time loss of 51.3 +/- 14.6 days. Female (hazard ratio [HR] = 8.35; 95% confidence intervals [CI] = 2.01-34.8), slower (HR = 3.51; 95% CI = 1.17-10.5), and less agile (HR = 2.22; 95% CI = 1.26-3.92) players as well as those with hip flexors tightness (HR = 1.12; 95% CI = 1.00-1.25) were at significantly greater risk for sustaining severe injuries. Conclusions: Limited studies are available on risk factors associated with amateur rugby players in the Sevens version. The development of gender-specific injury prevention measures that emphasize speed and agility training, and improve hip flexor extensibility may be important to reduce the risk of severe injuries. (C) 2017 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.