In case of rib ectropion, you should consult an orthopedic surgeon to determine whether the rib ectropion is due to the body’s metabolism or to the developmental process. In some cases, the exostosis is caused by vitamin D and calcium deficiency or abnormal vitamin D metabolism. This phenomenon is also known as rickets exostosis, which is a deformity of the skull, spine, knees, and other body parts in addition to the exostosis. In some older adolescents, especially females, the rib cartilage at the front of the rib cage is not fully developed during growth and development, resulting in a slight rib ectropion, but there is no deformity in other locations of the body, which is generally normal.