Why does clavicle fracture cause visible deformity after injury?

The clavicle connects the breastbone to the shoulder and sits close to the skin. When it breaks, the two sections may no longer line up. The weight of the arm and the pull of nearby muscles can draw the sections in different directions, creating a dip, bump or altered shoulder position. Bleeding and swelling around the fracture can make the contour more obvious. Pain often leads a person to support the arm and hold the shoulder differently, which can add to the visible asymmetry. The appearance alone cannot show whether the fracture is stable or whether nearby structures are affected.

Keep the arm supported in the position advised by a healthcare professional and avoid lifting, pushing or trying to straighten the collarbone yourself. Cold wrapped in cloth may ease swelling for short periods. A medical assessment usually checks the skin, nerves, blood flow and shoulder movement, with imaging used to view the bone alignment. Treatment depends on the fracture pattern and skin condition; it may involve a sling and follow-up, while some injuries need specialist management. Do not return to contact sport until healing and movement have been assessed.

Seek urgent care after a fall or blow if the bone is pressing against or has broken through the skin, the hand is pale, blue, cold or numb, or breathing is difficult. Increasing chest pain, severe swelling, weakness in the arm or uncontrolled pain also needs immediate assessment. A visibly changed shoulder should be examined even when pain seems manageable, because the deformity can accompany a fracture that needs protection and monitoring.

Ask where the fracture is, whether the skin and nerves are safe, how the alignment affects treatment, and how to use the sling. Clarify permitted arm movements, follow-up timing, warning signs, and the criteria for returning to work, driving or sport.