You should call 911 if :

• There is a suspected broken bone in the head, neck or back.
• There is a suspected broken hip, pelvis or upper leg.
• There are a lot of bleeding
• The area below the injured joint is pale, cold, clammy or bluish.
• You can not completely immobilize the injury at the scene without assistance from another person.
• There is a bone through the skin.

Although it is possible that other fractures are not emergencies, they still deserve medical attention, therefore, call your doctor to find out where and when. If  a young child refuses to put weight on an arm or leg after an accident, not moving the arm or leg, or the deformity can be seen clearly, assume that the child has a broken bone should be achieved medical help.