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Scrum Machine

This project aims to improve the safety and technique of rugby scrummage through the development of a fully adjustable device that can be attached to existing scrum machines. The solution focuses on maximizing back force and minimizing the risk of cervical spine injuries. Patent block received, model constructed, and biomechanical analysis completed.

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Scrum Machine

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  1. Scrum Machine Meredith Grow Alencia Woodard Advised by: Elizabeth Schlaeger, P.E. Dr. Kris Sadler

  2. Rugby • English sport • Ancestor of American football • General rules of the game • Penalties • Knock-ons • Off-sides

  3. The Scrum • Purpose • Positioning • Correct Posture • Injuries

  4. Injury Rates (US) • 1970 – 1995 • 35 injuries • 63% during engagement • 37% when scrum collapsed • 80% hookers • 17% prop • 3% second row

  5. Problem • Poor scrummage technique • Causes spinal injuries • Loss of scrum power • Needed • Additional instructional tools • Increased player experience

  6. System • 3 phases • Kinetic • Both sides push together (engaging) • Static • Engagement until ball is rolled in • Possible to calculate force components • Kinetic • Opposing sides attempt to displace each other

  7. Biomechanics • Assumptions • Flat back • Constant leg force • Back force = Leg force (i.e. neglecting lost force between back and legs) • Maximum back force = 1.5 * body weight • Back Force Averages: • Men = 300lb • Women = 240lb

  8. Force Diagram (Machine) y Fwall Z Fby θ Fbmax Fbz

  9. Force Diagram (Actual) base of neck Fbmax2 Z Fby θ Fbmax1 Fbz

  10. Maximize Fbz and eliminate Fby Done by ensuring Fbz = Fbmax (i.e. θ = 90°) Reduce possiblity of cervical spine injuries Resulting from the buckling effect of spine caused by Fby Objective

  11. Solution • Device • Attachment to an existing rugby scrum machine   • Design • Structure • Fully adjustable • Compatible with most commercially available scrum machines • Quick and easy adjustment • Target techniques • Staying low • Keeping the back flat

  12. Progress • Patent block received • Solution finalized • Model constructed • Biomechanical analysis complete

  13. Current Work • Select prototype materials • Collect survey wishes and demands • Create poster presentation • Write final paper

  14. Future Work • Construct prototype • Testing • Collect user input • Apply for patent • Explore future improvements • Feedback mechanism (light sensor and plumb line) • Method to improve practice technique to better resemble actual contact

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