In the context of compression fractures, which portion of the thoracic vertebrae is most commonly involved?

• A. Vertebral arch
• B. Spinous process
• C. Vertebral body
• D. Transverse process

Answer: (C)

The vertebral body is the portion of the thoracic vertebrae that is most commonly involved in compression fractures. This is primarily due to the mechanical load that the vertebral body bears during weight-bearing activities and when subjected to trauma. In cases of osteoporosis, where the bone density is significantly reduced, the vertebral body can be particularly susceptible to fracturing under normal stressors or even minor falls.

When a compression fracture occurs, it typically results in the loss of height in the vertebral body, leading to potential changes in spinal alignment, pain, and functional limitations. The vertebral body’s structure and position within the vertebral column emphasize its role in maintaining the stability and integrity of the spine, further highlighting why it is the focal point in compression injuries.

The other portions of the vertebrae, such as the vertebral arch, spinous process, and transverse process, are less commonly involved in compression fractures as they do not absorb the same amount of vertical stress as the vertebral body. This anatomical understanding is crucial for diagnosis and treatment in orthopedic practice.