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The common mechanisms of anterior cruciate ligament injuries in judo: a retrospective analysis
  1. S Koshida1,
  2. T Deguchi2,
  3. K Miyashita3,
  4. K Iwai4,
  5. Y Urabe5
  1. 1Faculty of Health Sciences, Ryotokuji University, Chiba, Japan
  2. 2Graduate School of Education, Hiroshima University, Hiroshima, Japan
  3. 3College of Life and Health Sciences, Chubu University, Aichi, Japan
  4. 4Hiroshima College of Maritime Technology, Institute of National Colleges of Technology, Hiroshima, Japan
  5. 5Graduate School of Health Sciences, Hiroshima University, Hiroshima, Japan
  1. Correspondence to S Koshida, Ryotokuji University, 5-8-1 Akemi Urayasu, Chiba 2798567, Japan


Background Although high prevalence of anterior cruciate ligament injuries (ACL) in judokas has been reported, there has been very little research concerning events preceding the injury.

Objective To determine the common situations and mechanisms of ACL injury in judo.

Methods A total of 43 cases of ACL injuries that had occurred during judo competition or practice were investigated, using questionnaires with interviews conducted by a single certified athletic trainer who has 20 years of judo experience to obtain information regarding the situation and mechanism in which the ACL injury occurred.

Results The number of ACL injuries when the participant's grip style was different from the style of the opponent (ie, kenka-yotsu style) (28 cases) was significantly greater than when the participant's grip style was the same as that of the opponent (ie, ai-yotsu style) (15 cases; p<0.001). The number of ACL injuries was significantly higher when the participant was attacked by the opponent than when counterattacked or when attempting the attack (p<0.001). In addition, being attacked with osoto-gari was revealed as the leading cause of ACL injury incidence among the participants (16.8%).

Conclusions Grip style may be associated with ACL injury occurrence in judo. In addition, direct contact due to the opponent's attack may be a common mechanism for ACL injuries in judo.

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  • Competing interests None

  • Ethics approval Prior to the study, all participants signed an informed consent form approved by the ethics committee at the Graduate School of Health Sciences, Hiroshima University, Hiroshima, Japan.