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Epidemiology and Outcomes of Ankle Injuries in the National Football League. | LitMetric
Background : Traumatic ankle injuries are commonly complicated by persistent symptoms and the development of chronic ankle instability.Purpose : To describe the epidemiology of ankle injuries in the National Football League (NFL) and investigate the effects that ankle injuries have on performance metrics in the years after injury.Study Design : Descriptive epidemiologic study.Methods : Ankle injuries sustained by NFL players during the 2015-2016, 2016-2017, and 2017-2018 seasons were identified using the Pro Football Reference database. Cumulative incidence was calculated, and demographic identifiers were collected for each injury. The return-to-play (RTP) rate was also recorded. For each player who met inclusion for the performance analysis, power rating (PR) was calculated for the preinjury season (Y-1) and 2 postinjury seasons (Y+1 and Y+2) as follows: = (/10) + ( × 6) + (s) + ( × 2) + ( × 2). Mean PRs were calculated for each season as well as the percentage change and mean difference in PR between Y-1 and Y+1 (ΔPR%, ΔPR) and between Y-1 and Y+2 (ΔPR%, ΔPR). Subgroup analyses of PR were performed by player position, injury type, and years of experience.Results : Overall, 668 ankle injuries were identified, with an average cumulative incidence across the 3 seasons of 11.2% and RTP rate of 91%. Of those injuries, 159 met inclusion criteria for the PR analysis. The mean overall PR (96.95 in Y-1) declined 22% in Y+1 to 76.10 (-20.85 [95% CI, -13.82 to -27.89]; < .001) and 27% in Y+2 to 70.93 (-26.02 [95% CI, -18.04 to -34.00]; < .001). The mean PR per game played (6.70 in Y-1) decreased 14% in Y+1 to 5.75 (-0.95 [95% CI, -0.56 to -1.34]; < .001) and 17% in Y+2 to 5.54 (-1.16 [95% CI, -0.63 to -1.62]; < .001).Conclusion : It was found that ankle injuries hampered the performance of NFL players, even multiple years after the injury occurred, despite a relatively high RTP rate. There was a decrease in total games played after ankle injuries as well as a decreased performance output per game played.
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