CAMRT Radiography Practice Exam

In what position are the zygapophyseal joints best demonstrated on a thoracic spine?

1. Lateral view

2. Oblique view

3. AP view

4. Supine view

The correct answer is: Oblique view

The zygapophyseal joints are best visualized in an oblique view of the thoracic spine due to the orientation and alignment of these joints. The zygapophyseal joints are the synovial joints located between the articular processes of adjacent vertebrae and are primarily positioned at an angle that is not well demonstrated in other standard views. In an oblique position, the rotation of the patient's body opens up the joint spaces, allowing for better visualization of the zygapophyseal joints on the respective side that is facing up. This view minimizes the overlap of the vertebral bodies and maximizes the exposure of the joint spaces, which is critical for accurate assessment in radiographic studies. Other views, such as lateral, AP, or supine, do not provide the same advantageous angle for visualizing these joints effectively. In the lateral view, the zygapophyseal joints are not opened sufficiently due to alignment relative to the plane of the film. The AP view tends to foreshorten and overlap the joint spaces, making the details less discernible. Similarly, being in a supine position, while beneficial for certain examinations, does not enhance the visibility of the zygapophyseal joints in the thoracic region