An interviewer-administered survey to investigate playing situations of ACL injury and a laboratory study which included a motion analysis of frequently performed movements was conducted to demonstrate the ACL injury mechanism in badminton. The interview with 21 ACL-injured badminton players showed that 2 typical injury situations related to the sports-specific movement. One is ACL injury opposite to the racket-hand side during a single-leg-landing after an overhead stroke in the backhand side of the court, and the other is that of the racket-hand side in the course of a plant-and-cut maneuver during side or backward stepping in the forehand side of the court. The kinematic and kinetic data in motion analysis study demonstrated that larger knee valgus angle and moment during single-leg-landing following back-steps to the backhand-side rear compared with those following back-steps to the forehand-side rear. These biomechanical features of knee motion in badminton might cause the high incidence of ACL injuries which occurred during single-leg-landing after an overhead stroke in the backhand-side rear court. A better understanding of ACL injury pattern in badminton helps to avoid the players from a risk of ACL injury and develop the efficient prevention program.
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