academic years. Deltoid ligament sprain injury rates, rate ratios, and injury proportion ratios with 95% confidence intervals (CIs) were reported.Results: During the study period, 380 deltoid ligament sprains were reported, resulting in a combined injury rate of 0.79/10 000 athlete-exposures (AEs; 95% CI ¼ 0.71, 0.87). Most deltoid ligament sprains occurred in practices (54.2%, n ¼ 206). However, the competition injury rate was higher than the practice injury rate (rate ratio ¼ 3.74; 95% CI ¼ 3.06, 4.57). The highest deltoid ligament sprain rates were in women's gymnastics (2.30/10 000 AEs; 95% CI ¼ 1.05, 3.55), men's soccer (1.73/10 000 AEs; 95% CI ¼ 1.14, 2.32), women's soccer (1.61/10 000 AEs; 95% CI ¼ 1.13, 2.09), and men's football (1.40/10 000 AEs; 95% CI ¼ 1.18, 1.62). Nearly half of all deltoid ligament sprains (49.7%, n ¼ 189) were due to player contact, and 39.5% (n ¼ 150) were non-time-loss injuries (ie, participation restricted for less than 24 hours). Only 8.2% (n ¼ 31) of deltoid ligament sprains were recurrent.Conclusions: The highest deltoid ligament sprain rates were in women's gymnastics, men's and women's soccer, and men's football. However, the rate for women's gymnastics was imprecise (ie, the CI was wide), highlighting the need for further surveillance of deltoid ligament sprains in the sport. Most deltoid ligament sprains were due to player contact. Future researchers should assess interventions that may prevent deltoid ligament sprains.Key Words: eversion sprains, medial ankle sprains, collegiate athletes
Key PointsMen's football and men's and women's soccer players had the highest rates of deltoid ligament sprains. Women gymnasts also had a high rate of deltoid ligament sprains, but the cell size was small and the confidence interval was wide. Player contact was the most common mechanism of injury.