In both rugby union and rugby league, a blood replacement (also referred to as a blood substitution or blood bin) is a special kind of substitution which can be used in the case of a player having to leave the field of play temporarily to have a wound attended to. Both rugby union and rugby league are physically demanding games, so musculoskeletal injuries are common, as well as injuries to the head and neck, and fractures.[1] During the IRB 2011 Rugby World Cup, a study was conducted to determine the frequency and nature of the injuries sustained. It confirmed that rugby, like many other contact sports, has a high incidence of injury.[2]