Recently, serious judo-related injuries have become a social problem in Japan and there is a strong interest in preventing cervical spinal cord injuries that could result in severe sequelae. We aimed to clarify the characteristics of severe judo-related neck injuries in Japan and to consider appropriate counter-measures. We retrospectively investigated individuals who had made claims to the All Japan Judo Federation's System for Compensation for Loss or Damage, for the rate of severe judo-related neck injuries. The estimated rate of severe neck injury (per 100,000 people) with the uchi-mata technique, which was the most common, was 0.86 for high school students, which was significantly higher than that of the other groups (P < 0.01). Among those with <5 years ofjudo experience, uchi-mata caused most injuries, but among those with 10-15 years of judo experience, the types of techniques varied widely. In the group with 5 years of experience, the main cause was considered to be a lack of skill, for which the instruction of kuzushi may be beneficial. For the group with 10-15 years of experience, we believe that there were injuries that were difficult to prevent due to the unpredictable forces from the dynamic movement of the two judoka working with and against one another, as is expected when people with considerable muscle strength grapple each other and perform techniques. Our findings provide insight into judo-related neck injuries, which can help in the creation of appropriate preventative measures.
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