Shoulder bone reduction surgery, illustration. At left, a fragment of bone is removed from the head of the humerus (upper arm bone). At right, the bone is held in position as it heals. This type of operation may be done to correct an improperly healed fracture (visible at the neck of the humerus), or to fix a bone deformity, or to fix a problem with the orientation of the humerus in relation to the shoulder joint.