@lauren said in [NRL cracks down on high tackles and six\-again rule](/post/1366219) said:
https://www.patreon.com/posts/failed-hias-and-51427297
NRL PHYSIO
MAY 19, 2021 AT 12:48 PM
Failed HIA’s and player positioning in the NRL
With plenty of talk around tackle heights and concussion risk after rule interpretations were tightened around high contact in the NRL, I decided to review the video of every failed HIA/concussion that has occurred in-game during the 2021 NRL season. Status of the injured player was recorded (tackler/ball carrier/contest) and if the tackler was injured the height and location of contact to the tackler (upright/high contact above the ball carrier’s chest, or bent/low contact below the ball carrier’s chest) was also noted. Results and discussion below:
Of the failed HIA’s/concussions suffered during NRL games this season:
Ball carrier - 33%
Tackler High - 37%
Tackler Low- 20%
Collision/contest - 10%
70% of failed HIA’s with tackler in high contact position (high contact to ball carrier or to the tackler themselves).
20% of failed HIA’s with tackler in low contact position.
Overall:
57% of failed HIA’s to the tackler
33% of failed HIA’s to ball carrier
10% of failed HIA’s during contest/collision
This tracks consistently with results from recent NRL seasons (2017-2020):
50-60% of head injuries to the tackler
30-40% of head injuries to the ball carrier
5-10% of head injuries in a collision
For comparison, in Rugby Union:
72% of head injuries to the tackler
28% of head injuries to the ball carrier
60-65% of tackler head injuries during low contact tackles, but approximately 85% of tackles put the head in low positions
35% of tackler head injuries happen during high contact tackles, approximately 15% of tackles put the head in high positions
In Rugby Union, for every 1000 higher contact tackles, there was 3.7 HIAs, compared to for every 1000 lower contact tackles, 0.9 HIAs. (All union stats via @scienceofsport on Twitter)
Unfortunately there are no official stats on overall % of high vs low position tackles in the NRL. Anecdotally it would appear high position tackles happen a lot more commonly in league than union (just 15% of all tackles) with the evolution of the modern tackle technique to lock up the ball and have greater control over the ball carrier’s positioning.
It would be useful to have access to this information to calculate and compare the overall risk of a failed HIA for low/high position tackles (e.g. in union high position tackles are 4.1 times more likely to result in a HIA than low position tackles).
With 70% of failed HIA’s in 2021 occurring with the tackler in a high/upright position, it would appear that like in rugby union getting the NRL tackler into lower positions would reduce the risk of both players (tackler & ball carrier) requiring/failing a HIA. It is worth considering that hip/knee to head contact was responsible for almost all of the 20% of low tackler position failed HIA’s, so it is likely the sweet spot (lowest risk) for tackler contact is between the hips and chest of the ball carrier.