July 2018

Young Athletes’ ACL Injury Risk Increases with Fatigue

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ACL injuries are one of the most common sports injuries affecting adolescent athletes, leading to lost playing time and high healthcare costs. Athletes who experience fatigue – tested on a standardized assessment — demonstrated increased risk of ACL injury, according to this study, which is the first to measure the direct impact of fatigue on injury risk in the adolescent population.

“We studied 85 athletes at an average age of 15.4 years and found 44.7% showed an increased injury risk after high-intensity aerobic activity,” noted lead author Mohsin S. Fidai, MD, from Henry Ford Health System in Detroit. “Additionally, 68% of those studied were identified as having a medium- or high-risk for injury following the activity, as compared to 44% at baseline.”

The study utilized vertical and drop-jump assessments of each athlete, which were captured on video and reviewed by 11 professional health observers. Participants included track and field, basketball, volleyball, and soccer athletes. Injury risk was also associated with the level of fatigue, as 14 of 22 athletes demonstrating over 20% fatigue showed an increased ACL injury risk. Female athletes and those over age 15 were also more likely to demonstrate an increased injury risk.

“While ACL injury prevention programs are commonly used now, a decrease in injury numbers has not followed suit,” commented Fidai. “We hope this study helps advocate for ACL injury prevention training programs to incorporate fatigue resistance training and awareness by coaches, trainers and physical education teachers.”

Fidai presented his paper, “Fatigue Increases ACL Injury Risk in Youth Athletes: Risk Assessment

Study Using Drop-Jump Test,” during a session titled, Team Physician: Science of Injury.

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