Final answer:
The patient was over-rotated, as indicated by the lack of superimposition of the left and right anterior ribs with the left thorax rotated anteriorly during the lateral sternum exam.
Step-by-step explanation:
If on a lateral sternum, left and right anterior ribs are not superimposed, and the left thorax is rotated anteriorly, it indicates that the patient was over-rotated. During a lateral sternum examination, proper technique requires that the left and right anterior ribs should be superimposed to ensure an accurate image. If there is a lack of superimposition, this usually suggests that there has been too much rotation, meaning the left side of the thorax should not be rotated more towards the image receptor.
The sternum, which is an elongated bony structure of the anterior thoracic cage, is composed of the manubrium, body, and xiphoid process. Correct alignment during imaging is crucial to accurately visualize these structures without distortion. If the position were correct, both sets of anterior ribs would be superimposed, reflecting a correctly positioned patient.