A potential link between concussion and violent crime is becoming clearer.

New research out of AUT shows even a mild traumatic brain injury can significantly increase the risk of violent criminal behaviour over the following decade.

Researchers looked at a comparative group based on various socio-economic backgrounds.

Sports injury research specialist Doug King told Mike Hosking it doesn't have to be a serious injury.

He says he sees it come through as child abuse, domestic violence, from players who have had head injuries in all sorts of sports.

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