Originally Posted by Quicksilver

Current medical terminology in the United States uses the term collision sport rather than contact sport to refer to Rugby, American football, lacrosse, and ice hockey. The term contact sport is used to refer to sports, such as basketball and association football that allow limited contact. For example, the American Academy of Pediatrics issued a policy statement in 2001 entitled "Medical Conditions Affecting Sports Participation" that included the following definitions:

In "collision" sports (eg, boxing, ice hockey, football, and rodeo), athletes purposely hit or collide with each other or inanimate objects, including the ground, with great force. In "contact" sports (eg, basketball and soccer), athletes routinely make contact with each other or inanimate objects but usually with less force than in collision sports.