Rugby may undergo its most radical transformation yet with the governing body considering a ban on tackling above the waist.
Video analysis of 600 head injuries by World Rugby's medical unit has led to the game considering trials at youth level to reduce the number of concussions being suffered.
Chief medical officer Dr Martin Rafferty said: "We've found that if the ball carrier is bent at the waist then he has reduced injuries. If the tackler's bent at the waist, he has reduced injuries."
The discoveries include that 72 per cent of head injuries occur in the tackle, and 76 per cent of those are suffered by the tackler.
New Zealand Rugby scientist Ken Quarrie, who also works for World Rugby's advisory group, is quoted in The Telegraph saying: " "I'd certainly like to see a trial at the junior levels for a start.