Collar Bone or Clavicle, located between the shoulder blade and the ribcage, is the bone that connects the arm to the breast bone (called sternum). A broken collar bone is termed as a clavicle fracture, common among people of all ages. Clavicle is a long bone, and the breaks would occur mostly in its middle, and rarely at the shoulder blade or ribcage. Clavicle fractures are often caused due to a fall onto the shoulder or an outstretched arm, or a vehicular collision. These fractures tend to be very painful, making it hard for arm movement. Other symptoms include sagging shoulder, a deformity over the break, swelling, bruising and softness over the collar bone.