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Pre-binding prior to full engagement improves loading conditions for front-row players in contested Rugby Union

E Preatoni1, D Cazzola1, K A Stokes1

  • 1Sport, Health and Exercise Science, Department for Health, University of Bath, Bath, UK.

Scandinavian Journal of Medicine & Science in Sports
|November 27, 2015
PubMed
Summary

The "PreBind" rugby scrum engagement protocol reduces biomechanical stress and injury risk by decreasing set-up distance and contact speed. This safer engagement method does not compromise scrummaging force generation.

Keywords:
Impact biomechanicsinjury preventionpressurescrummaging techniquesports performancewearable sensors

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Area of Science:

  • Sports Biomechanics
  • Rugby Union Safety

Background:

  • Contested scrums in Rugby Union involve significant biomechanical forces.
  • Current engagement protocols may contribute to acute and chronic injuries in front-row players.

Purpose of the Study:

  • To investigate the biomechanical effects of the
  • PreBind
  • scrum engagement protocol.
  • To compare
  • PreBind
  • with traditional protocols (CTPE, CTS) across different playing levels.

Main Methods:

  • Live scrummaging performed by 27 Rugby Union teams across five playing levels.
  • Biomechanical data collected using video analysis, pressure sensors, and inertial measurement units.
  • Comparison of engagement protocols: Crouch-Touch-Pause-Engage (CTPE), Crouch-Touch-Set (CTS), and PreBind (Crouch-Bind-Set).

Main Results:

  • PreBind significantly reduced set-up distance (-27%) and engagement speed (>20%).
  • Peak biomechanical stresses during engagement decreased by 14-25% with PreBind compared to CTPE and CTS.
  • No significant reduction in force generation during the sustained push phase was observed.
  • No main effects or interactions found related to playing level.

Conclusions:

  • The PreBind protocol enhances scrummaging safety by mitigating peak biomechanical stresses.
  • Pre-binding offers a safer engagement method without compromising scrum performance.
  • This protocol may reduce the risk of both acute and chronic injuries in rugby front-rows.