The clavicular fracture is often caused by indirect force.In a fall, if the lateral side of shoulder or the palm first touches the ground, the force may be transmitted through acromioclavicular joint to the clavicle, leading to clavicular fracture. Most cases of the fracture are shortly oblique or transverse. Besides overlapping displacement, the proximal end of fracture may displace backward and upward because of traction of sternocleidomastoid muscle, and the distal end may displace forward and downward because of traction of both arm weight and greater pectoral muscle. Greenstick fracture mostly occurs in children.