Neurocognitive Errors and Noncontact Anterior Cruciate Ligament Injuries in Professional Male Soccer Players

<jats:sec> <jats:title>Context</jats:title> <jats:p>Evidence is emerging that core neurocognitive functions such as working memory and inhibitory control (ie, motor-response and attentional inhibition) are linked to the anterior cruciate ligament (ACL) injury risk. Research has been conducted in laboratory settings, but the contribution of neurocognition to actual ACL injuries under real-world conditions is unknown.</jats:p> </jats:sec> <jats:sec> <jats:title>Objective</jats:title> <jats:p>To describe the possible neurocognitive errors involved in noncontact ACL injury mechanisms.</jats:p> </jats:sec> <jats:sec> <jats:title>Design</jats:title> <jats:p>Case series.</jats:p> </jats:sec> <jats:sec> <jats:title>Setting</jats:title> <jats:p>Soccer matches.</jats:p> </jats:sec> <jats:sec> <jats:title>Patients or Other Participants</jats:title> <jats:p>A total of 47 professional male soccer players.</jats:p> </jats:sec> <jats:sec> <jats:title>Main Outcome Measure(s)</jats:title> <jats:p>Three independent reviewers evaluated 47 videos of players sustaining noncontact ACL injuries. Neurocognitive errors in inhibitory control were operationalized as follows: (1) motor-response inhibition was scored when a player demonstrated poor decision-making and approached the opponent with high speed that reduced the ability to stop or change the intended action and (2) an attentional error was scored when a player shifted his selective attention away from the relevant task to irrelevant stimuli.</jats:p> </jats:sec> <jats:sec> <jats:title>Results</jats:title> <jats:p>Of 47 noncontact ACL injuries, 26 (55%) were related to a pressing-type injury, 19 (73%) of which involved a deceiving action made by the opponent, suggesting poor inhibitory control of the defender. Of the remaining 21 noncontact ACL injuries (45%), 16 (76%) could be attributed to attentional errors. Agreement among the 3 raters was very good for all items except poor decision-making, which showed fair to good agreement (Fleiss κ = 0.71). Interrater reliability was excellent (intraclass correlation coefficient = 0.99–1.00).</jats:p> </jats:sec> <jats:sec> <jats:title>Conclusions</jats:title> <jats:p>Errors in motor-response inhibitory control and attentional inhibition were common during noncontact ACL injury events in professional male soccer players. The interrater agreement in detecting neurocognitive errors in general was very good.</jats:p> </jats:sec>