The interclavicular ligament is located in the arm, chest and back. The clavicle (collarbone) acts as a brace for the freely movable scapula (shoulder blade), and helps to hold the shoulders in place. It also provides attachments for the muscles, tendons, and the interclavicular ligaments. As a result of its elongated double curve, the clavicle is weakly built. If it is compressed from the end by abnormal pressures on the shoulder, it is likely to fracture.