What type of vertebral change characterizes Scheuermann's disease?

Scheuermann's disease, often seen in adolescents, is characterized by structural changes in the thoracic spine, particularly the development of kyphosis. The key feature of this condition is the wedging of the thoracic vertebrae. This wedging leads to an abnormal anterior curvature of the spine, causing the characteristic hunchback appearance.

In Scheuermann's disease, the vertebrae become shaped like wedges, which is a significant deviation from their normal rectangular form. This wedging is a result of both vertebral body growth abnormalities and alterations in the endplates. Over time, these changes can lead to spine deformities and potential postural issues, making it essential to recognize and diagnose early on.

Other options such as fusion of vertebrae, disc herniation, and fractures are not typical characteristics of Scheuermann's disease. While they may be seen in other spinal conditions, they do not define the vertebral changes associated with this specific disease. Understanding the correct features of Scheuermann's disease is crucial for diagnosis and subsequent management of the condition.