Comparison of rugby league and rugby union is possible because of the games' similarities and shared origins. Initially, following the 1895 split in rugby football, rugby league and rugby union differed in administration only. Soon however, the rules of rugby league were modified, resulting in two distinctly different forms of rugby. After 100 years rugby union joined rugby league, and most other forms of football, as an openly professional sport.
In the field of athletics, a common dialogue of coaches, administrators, athletes, and the media surrounds player safety and concussions. Although the majority of concussions are not associated with a loss of consciousness, the long term affects of these sometimes minor traumatic brain injuries can be devastating. Concussions can occur in many sports, with the NCAA rating Women’s Hockey as the collegiate sport with the highest rate of reported concussions.