Ice hockey is a full contact sport and carries a high risk of injury. Players are moving at speeds around approximately and much of the game revolves around the physical contact between the players. Skate blades, hockey sticks, shoulder contact, hip contact, and hockey pucks can all potentially cause injuries. The types of injuries associated with hockey include: lacerations, concussions, contusions, ligament tears, broken bones, hyperextensions, and muscle strains. Women's ice hockey players are allowed to contact other players but are not allowed to body check.